Nouns denoting plants

aalii
a small Hawaiian tree with hard dark wood
 
abelia
any of various deciduous or evergreen ornamental shrubs of the genus Abelia having opposite simple leaves and cymes of small white or pink or purplish flowers; Asia and Mexico
 
Abelmoschus esculentus
tall coarse annual of Old World tropics widely cultivated in southern United States and West Indies for its long mucilaginous green pods used as basis for soups and stews; sometimes placed in genus Hibiscus
 
Abelmoschus moschatus
bushy herb of tropical Asia grown for its yellow or pink to scarlet blooms that resemble the hibiscus
 
Abies bracteata
a pyramidal fir of southwestern California having spiny pointed leaves and cone scales with long spines
 
Abies fraseri
small fast-growing but short-lived fir of southern Alleghenies similar to balsam fir but with very short leaves
 
Abies grandis
lofty fir of the Pacific coast of northwestern America having long curving branches and deep green leaves
 
Abies lasiocarpa
medium-tall timber tree of the Rocky Mountains having a narrowly conic to columnar crown
 
Abronia elliptica
plant having heads of fragrant white trumpet-shaped flowers; grows in sandy arid regions
 
Abronia fragrans
taller than Abronia elliptica and having night-blooming flowers
 
Abronia latifolia
plant having hemispherical heads of yellow trumpet-shaped flowers; found in coastal dunes from California to British Columbia
 
Abronia maritima
plant having hemispherical heads of wine-red flowers; found in coastal dunes from California to Mexico
 
Abronia umbellata
prostrate herb having heads of deep pink to white flowers; found in coastal dunes from British Columbia to Baja California
 
Abronia villosa
soft-haired sticky plant with heads of bright pink trumpet-shaped flowers; found in sandy desert soil; after ample rains may carpet miles of desert with pink from the southwestern United States to northern Mexico
 
abruptly-pinnate leaf
a pinnate leaf with a pair of leaflets at the apex
 
Abutilon theophrasti
tall annual herb or subshrub of tropical Asia having velvety leaves and yellow flowers and yielding a strong fiber; naturalized in southeastern Europe and United States
 
acacia
any of various spiny trees or shrubs of the genus Acacia
 
Acacia auriculiformis
Australian tree that yields tanning materials
 
Acacia cambegei
scrubby Australian acacia having extremely foul-smelling blossoms
 
Acacia dealbata
evergreen Australasian tree having white or silvery bark and young leaves and yellow flowers
 
Acacia farnesiana
tropical American thorny shrub or small tree; fragrant yellow flowers used in making perfumery
 
Acacia melanoxylon
tall Australian acacia yielding highly valued black timber
 
Acacia pycnantha
shrubby Australian tree having clusters of fragrant golden yellow flowers; widely cultivated as an ornamental
 
Acacia xanthophloea
African tree supposed to mark healthful regions
 
Acalypha virginica
weedy herb of eastern North America
 
Acanthocereus tetragonus
cactus of the southwestern United States and northern Mexico having edible juicy fruit
 
acanthus
any plant of the genus Acanthus having large spiny leaves and spikes or white or purplish flowers; native to Mediterranean region but widely cultivated
 
Acanthus mollis
widely cultivated southern European acanthus with whitish purple-veined flowers
 
accessory fruit
fruit containing much fleshy tissue besides that of the ripened ovary; as apple or strawberry
 
acellular slime mold
a slime mold of the class Myxomycetes
 
Acer argutum
small shrubby Japanese plant with leaves having 5 to 7 acuminate lobes; yellow in autumn
 
Acer campestre
shrubby Eurasian maple often used as a hedge
 
Acer circinatum
small maple of northwestern North America having prostrate stems that root freely and form dense thickets
 
Acer macrophyllum
maple of western North America having large 5-lobed leaves orange in autumn
 
Acer negundo
common shade tree of eastern and central United States
 
Acer negundo Californicum
maple of the Pacific coast of the United States; fruits are white when mature
 
Acer pennsylvanicum
maple of eastern North America with striped bark and large two-lobed leaves clear yellow in autumn
 
Acer platanoides
a large Eurasian maple tree naturalized in North America; five-lobed leaves yellow in autumn; cultivated in many varieties
 
Acer pseudoplatanus
Eurasian maple tree with pale grey bark that peels in flakes like that of a sycamore tree; leaves with five ovate lobes yellow in autumn
 
Acer rubrum
maple of eastern and central America; five-lobed leaves turn scarlet and yellow in autumn
 
Acer saccharinum
a common North American maple tree; five-lobed leaves are light green above and silvery white beneath; source of hard close-grained but brittle light-brown wood
 
Acer saccharum
maple of eastern and central North America having three-lobed to five-lobed leaves and hard close-grained wood much used for cabinet work especially the curly-grained form; sap is chief source of maple syrup and maple sugar; many subspecies
 
Acer spicatum
small shrubby maple of eastern North America; scarlet in autumn
 
acerate leaf
the leaf of a conifer
 
acervulus
small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi
 
achene
small dry indehiscent fruit with the seed distinct from the fruit wall
 
achillea
any of several plants of the genus Achillea native to Europe and having small white flowers in flat-topped flower heads
 
Achillea millefolium
ubiquitous strong-scented mat-forming Eurasian herb of wasteland, hedgerow or pasture having narrow serrate leaves and small usually white florets; widely naturalized in North America
 
Achillea ptarmica
Eurasian herb having loose heads of button-shaped white flowers and long grey-green leaves that cause sneezing when powdered
 
achimenes
any plant of the genus Achimenes having showy bell-shaped flowers that resemble gloxinias
 
acinus
one of the small drupes making up an aggregate or multiple fruit like a blackberry
 
Acocanthera oblongifolia
medium-sized shrubby tree of South Africa having thick leathery evergreen leaves and white or pink flowers and globose usually two-seeded purplish black fruits
 
Acocanthera oppositifolia
evergreen shrub or tree of South Africa
 
aconite
any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers
 
Aconitum lycoctonum
poisonous Eurasian perennial herb with broad rounded leaves and yellow flowers and fibrous rootstock
 
Aconitum napellus
a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite
 
acorn
fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base
 
acorn cup
cup-shaped structure of hardened bracts at the base of an acorn
 
acorn squash
squash plant bearing small acorn-shaped fruits having yellow flesh and dark green or yellow rind with longitudinal ridges
 
Acorus calamus
perennial marsh plant having swordlike leaves and aromatic roots
 
acrocarp
a moss in which the main axis is terminated by the archegonium (and hence the capsule)
 
Acrocarpus fraxinifolius
East Indian timber tree with hard durable wood used especially for tea boxes
 
Acroclinium roseum
flower of southwestern Australia having bright pink daisylike papery flowers; grown for drying
 
Acrocomia aculeata
tropical American feather palm having a swollen spiny trunk and edible nuts
 
Acrocomia vinifera
tropical American palm having edible nuts and yielding a useful fiber
 
acrogen
any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem
 
Acrostichum aureum
stout tropical swamp fern (especially tropical America) having large fronds with golden yellow sporangia covering the undersides
 
Actaea alba
North American herb with white poisonous berries
 
Actaea rubra
North American perennial herb with alternately compound leaves and racemes of small white flowers followed by bright red oval poisonous berries
 
Actinidia arguta
climbing Asiatic vine having long finely serrate leaves and racemes of white flowers followed by greenish-yellow edible fruit
 
Actinidia deliciosa
climbing vine native to China; cultivated in New Zealand for its fuzzy edible fruit with green meat
 
Actinidia polygama
ornamental vine of eastern Asia having yellow edible fruit and leaves with silver-white markings
 
Actinomeris alternifolia
perennial herb with showy yellow flowers; the eastern United States
 
aculeus
a stiff sharp-pointed plant process
 
acumen
a tapering point
 
acuminate leaf
a leaf narrowing to a slender point
 
Adam's needle-and-thread
yucca with long stiff leaves having filamentlike appendages
 
Adansonia digitata
African tree having an exceedingly thick trunk and fruit that resembles a gourd and has an edible pulp called monkey bread
 
Adansonia gregorii
Australian tree having an agreeably acid fruit that resembles a gourd
 
adder's tongue
ferns with fertile spikes shaped like a snake's tongue
 
Adenanthera pavonina
East Indian tree with racemes of yellow-white flowers; cultivated as an ornamental
 
Adenium multiflorum
South African shrub having a swollen succulent stem and bearing showy pink and white flowers after the leaves fall; popular as an ornamental in tropics
 
Adiantum capillus-veneris
delicate maidenhair fern with slender shining black leaf stalks; cosmopolitan
 
Adiantum tenerum
tropical American fern with broad pinnae; widely cultivated
 
Adiantum tenerum farleyense
named for a country house in Barbados where it was discovered
 
Adlumia fungosa
vine with feathery leaves and white or pinkish flowers; sometimes placed in genus Fumaria
 
Adonis annua
Eurasian herb cultivated for its deep red flowers with dark centers
 
adventitious root
root growing in an unusual location e.g. from a stem
 
aeciospore
spore of a rust fungus formed in an aecium
 
aecium
fruiting body of some rust fungi bearing chains of aeciospores
 
Aegiceras majus
an Australian tree resembling the black mangrove of the West Indies and Florida
 
Aegilops triuncalis
European grass naturalized as a weed in North America; sharp-pointed seeds cause injury when eaten by livestock
 
Aeonium haworthii
perennial subshrub of Tenerife having leaves in rosettes resembling pinwheels
 
aerides
any orchid of the genus Aerides
 
aerophyte
plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it
 
aeschynanthus
a plant of the genus Aeschynanthus having somewhat red or orange flowers and seeds having distinctive hairs at base and apex
 
Aeschynanthus radicans
epiphyte or creeping on rocks; Malaysian plant having somewhat fleshy leaves and bright red flowers
 
Aesculus hippocastanum
tree having palmate leaves and large clusters of white to red flowers followed by brown shiny inedible seeds
 
Aethusa cynapium
European weed naturalized in America that resembles parsley but causes nausea and poisoning when eaten
 
Aframomum melegueta
West African plant bearing pungent peppery seeds
 
African bowstring hemp
bowstring hemp of South Africa
 
African daisy
shrub of southwestern Mediterranean region having yellow daisylike flowers
 
African daisy
African or Asiatic herbs with daisylike flowers
 
African daisy
any of several plants of the genus Arctotis having daisylike flowers
 
African mahogany
African tree having hard heavy odorless wood
 
African marigold
a stout branching annual with large yellow to orange flower heads; Mexico and Central America
 
African sandalwood
small shrubby African tree with hard wood used as a dyewood yielding a red dye
 
Afrocarpus falcata
medium-sized tree of South Africa
 
agamete
an asexual reproductive cell
 
Agapanthus africanus
African plant with bright green evergreen leaves and umbels of many usually deep violet-blue flowers
 
agaric
a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside
 
Agaricus arvensis
coarse edible mushroom with a hollow stem and a broad white cap
 
Agaricus campestris
common edible mushroom found naturally in moist open soil; the cultivated mushroom of commerce
 
Agastache foeniculum
much-branched North American herb with an odor like fennel
 
Agastache mexicana
erect perennial of Mexico having rose to crimson flowers
 
Agastache nepetoides
erect perennial with stout stems and yellow-green flowers; southern Canada and southeastern United States
 
Agathis australis
tall timber tree of New Zealand having white straight-grained wood
 
Agathis dammara
native to the Moluccas and Philippines; a source of dammar resin
 
Agathis lanceolata
New Zealand tree with glossy leaves and scaly reddish-brown bark
 
Agathis robusta
Australian timber tree resembling the kauri but having wood much lighter in weight and softer
 
Agave americana
widely cultivated American monocarpic plant with greenish-white flowers on a tall stalk; blooms only after ten to twenty years and then dies
 
Agave atrovirens
Mexican plant used especially for making pulque which is the source of the colorless Mexican liquor, mescal
 
Agave cantala
Philippine plant yielding a hard fibre used in making coarse twine
 
Agave sisalana
Mexican or West Indian plant with large fleshy leaves yielding a stiff fiber used in e.g. rope
 
Agave tequilana
Mexican plant used especially for making tequila
 
Ageratina altissima
American herb having flat-topped clusters of small white flower heads; reputedly a cause of trembles and milk sickness; sometimes placed in genus Eupatorium
 
ageratum
any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers
 
Ageratum houstonianum
small tender herb grown for its fluffy brushlike blue to lavender blooms
 
aggregate fruit
fruit consisting of many individual small fruits or drupes derived from separate ovaries within a common receptacle: e.g. blackberry; raspberry; pineapple
 
Aglaomorpha meyeniana
epiphytic fern with large fronds; Taiwan and Philippines
 
Aglaonema modestum
erect or partially climbing herb having large green or variegated leaves
 
Agrimonia eupatoria
erect perennial Old World herb of dry grassy habitats
 
Agrimonia procera
fragrant European perennial herb found at woodland margins on moist soils
 
agrimonia
a plant of the genus Agrimonia having spikelike clusters of small yellow flowers
 
Agropyron cristatum
Eurasian grass grown in United States great plains area for forage and erosion control
 
Agropyron intermedium
Asiatic grass introduced into United States rangelands for pasture and fodder
 
Agropyron repens
European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed
 
Agropyron smithii
valuable forage grass of western United States
 
Agropyron subsecundum
a wheatgrass with straight terminal awns on the flowering glumes
 
Agropyron trachycaulum
North American grass cultivated in western United States as excellent forage crop
 
Agrostemma githago
European annual having large trumpet-shaped reddish-purple flowers and poisonous seed; a common weed in grainfields and beside roadways; naturalized in America
 
Agrostis nebulosa
Spanish grass with light feathery panicles grown for dried bouquets
 
Agrostis palustris
common pasture or lawn grass spread by long runners
 
ailanthus
any of several deciduous Asian trees of the genus Ailanthus
 
Ailanthus altissima
deciduous rapidly growing tree of China with foliage like sumac and sweetish fetid flowers; widely planted in United States as a street tree because of its resistance to pollution
 
Ajuga chamaepitys
low-growing annual with yellow flowers dotted red; faintly aromatic of pine resin; Europe, British Isles and North Africa
 
Ajuga genevensis
upright rhizomatous perennial with bright blue flowers; southern Europe
 
Ajuga pyramidalis
European evergreen carpeting perennial
 
Ajuga reptans
low rhizomatous European carpeting plant having spikes of blue flowers; naturalized in parts of United States
 
Albatrellus dispansus
a rare fungus having a large (up to 14 inches wide) yellow fruiting body with multiple individual caps and a broad central stalk and a fragrant odor
 
Albatrellus ovinus
a fungus with a whitish often circular cap and a white pore surface and small pores and a white central stalk; found under conifers; edible but not popular
 
Albizia saman
large ornamental tropical American tree with bipinnate leaves and globose clusters of flowers with crimson stamens and seed pods that are eaten by cattle
 
albizia
any of numerous trees of the genus Albizia
 
Albizzia julibrissin
attractive domed or flat-topped Asiatic tree having bipinnate leaves and flowers with long silky stamens
 
Albizzia lebbeck
large spreading Old World tree having large leaves and globose clusters of greenish-yellow flowers and long seed pods that clatter in the wind
 
albuca
any of various plants of the genus Albuca having large clusters of pale yellow flowers; South Africa
 
alder
wood of any of various alder trees; resistant to underwater rot; used for bridges etc
 
alder
north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant
 
Aldrovanda vesiculosa
floating aquatic carnivorous perennial of central and southern Europe, Africa, Asia, Australia having whorls of 6 to 9 leaves ending in hinged lobes for capturing e.g. water fleas
 
Aletris aurea
colicroot with yellow-bracted racemose flowers; smaller than Aletris farinosa; southeastern United States
 
Aletris farinosa
colicroot having a scurfy or granuliferous perianth and white flowers; southeastern United States
 
Aleuria aurantia
a discomycete with bright orange cup-shaped or saucer-shaped fruiting bodies and pale orange exteriors
 
Aleurites fordii
Chinese tree bearing seeds that yield tung oil
 
Aleurites moluccana
large tree native to southeastern Asia; the nuts yield oil used in varnishes; nut kernels strung together are used locally as candles
 
algarobilla
mesquite pod used in tanning and dyeing
 
algarroba
long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute
 
Alisma plantago-aquatica
marsh plant having clusters of small white or pinkish flowers and broad pointed or rounded leaves
 
allamanda
a plant of the genus Allamanda having large showy funnel-shaped flowers in terminal cymes
 
Allamanda cathartica
vigorous evergreen climbing plant of South America having glossy leathery foliage and golden yellow flowers
 
Allegheny chinkapin
shrubby chestnut tree of southeastern United States having small edible nuts
 
Allegheny mountain spurge
low semi-evergreen perennial herb having small spikes of white or pinkish flowers; native to southern United States but grown elsewhere
 
alliaceous plant
bulbous plants having a characteristic pungent onion odor
 
Alliaria officinalis
European herb that smells like garlic
 
Allionia incarnata
trailing plant having crowded clusters of 3 brilliant deep pink flowers resembling a single flower blooming near the ground; found in dry gravelly or sandy soil; southwestern United States and Mexico
 
Allium acuminatum
a common North American wild onion with a strong onion odor and an umbel of pink flowers atop a leafless stalk; British Columbia to California and Arizona and east to Wyoming and Colorado
 
Allium ampeloprasum
coarse Old World perennial having a large bulb and tall stalk of greenish purple-tinged flowers; widely naturalized
 
Allium canadense
North American bulbous plant
 
Allium carinatum
Eurasian bulbous plant
 
Allium cepa
bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
 
Allium cepa aggregatum
type of onion plant producing small clustered mild-flavored bulbs used as seasoning
 
Allium cepa viviparum
type of perennial onion grown chiefly as a curiosity or for early salad onions; having bulbils that replace the flowers
 
Allium cernuum
widely distributed North American wild onion with white to rose flowers
 
Allium fistulosum
Asiatic onion with slender bulbs; used as early green onions
 
Allium haematochiton
onion with white to deep red tunic; California
 
Allium neopolitanum
European onion with white flowers
 
Allium paradoxum
leek producing bulbils instead of flowers; Russia and Iran
 
Allium porrum
plant having a large slender white bulb and flat overlapping dark green leaves; used in cooking; believed derived from the wild Allium ampeloprasum
 
Allium sativum
bulbous herb of southern Europe widely naturalized; bulb breaks up into separate strong-flavored cloves
 
Allium schoenoprasum
perennial having hollow cylindrical leaves used for seasoning
 
Allium scorodoprasum
European leek cultivated and used like leeks
 
Allium sphaerocephalum
Old World leek with a spherical bulb
 
Allium tricoccum
North American perennial having a slender bulb and whitish flowers
 
Allium triquetrum
European leek naturalized in Great Britain; leaves are triangular
 
Allium tuberosum
a plant of eastern Asia; larger than Allium schoenoprasum
 
Allium ursinum
pungent Old World weedy plant
 
Allium vineale
pungent Old World wild onion
 
allspice
deciduous shrubs having aromatic bark; eastern China; southwestern and eastern United States
 
almond oil
pale yellow fatty oil expressed from sweet or bitter almonds
 
almond tree
any of several small bushy trees having pink or white blossoms and usually bearing nuts
 
Alnus incana
native to Europe but introduced in America
 
Alnus maritima
shrub or small tree of southeastern United States having soft light brown wood
 
Alnus rhombifolia
tree of western United States
 
Alnus rugosa
common shrub of Canada and northeastern United States having shoots scattered with rust-colored down
 
Alnus serrulata
common shrub of the eastern United States with smooth bark
 
Alnus veridis
shrub of mountainous areas of Europe
 
Alnus veridis crispa
North American shrub with light green leaves and winged nuts
 
Alocasia macrorrhiza
large evergreen with extremely large erect or spreading leaves; cultivated widely in tropics for its edible rhizome and shoots; used in wet warm regions as a stately ornamental
 
alocasia
any plant of the genus Alocasia having large showy basal leaves and boat-shaped spathe and reddish berries
 
aloe
succulent plants having rosettes of leaves usually with fiber like hemp and spikes of showy flowers; found chiefly in Africa
 
Aloe ferox
much-branched South African plant with reddish prickly succulent leaves
 
Aloe vera
very short-stemmed plant with thick leaves with soothing mucilaginous juice; leaves develop spiny margins with maturity; native to Mediterranean region; grown widely in tropics and as houseplants
 
Alopecurus pratensis
stout erect perennial grass of northern parts of Old World having silky flowering spikes; widely cultivated for pasture and hay; naturalized in North America
 
Alpine enchanter's nightshade
an Alpine variety of enchanter's nightshade
 
Alpine golden chain
an ornamental shrub or tree of the genus Laburnum
 
Alpinia galanga
southeastern Asian perennial with aromatic roots
 
Alpinia officinarum
Chinese perennial with pyramidal racemes of white flowers and pungent aromatic roots used medicinally and as flavoring
 
Alpinia purpurata
an ornamental ginger native to Pacific islands
 
Alpinia Zerumbet
cultivated for its shining oblong leaves and arching clusters of white flowers with pink shading and crinkled yellow lips with variegated magenta stripes
 
Alstonia scholaris
evergreen tree of eastern Asia and Philippines having large leathery leaves and small green-white flowers in compact cymes; bark formerly used medicinally
 
alstroemeria
any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers
 
Alstroemeria pelegrina
an Andean herb having umbels of showy pinkish-purple lily-like flowers
 
Alternanthera philoxeroides
prolific South American aquatic weed having grasslike leaves and short spikes of white flowers; clogs waterways with dense floating masses
 
althaea
any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea
 
Althea officinalis
European perennial plant naturalized in United States having triangular ovate leaves and lilac-pink flowers
 
Althea rosea
plant with terminal racemes of showy white to pink or purple flowers; the English cottage garden hollyhock
 
alumbloom
any of several herbs of the genus Heuchera
 
alyssum
any garden plant of the genus Alyssum having clusters of small yellow or white flowers
 
Amanita caesarea
widely distributed edible mushroom resembling the fly agaric
 
Amanita mappa
agaric often confused with the death cup
 
Amanita muscaria
poisonous (but rarely fatal) woodland fungus having a scarlet cap with white warts and white gills
 
Amanita phalloides
extremely poisonous usually white fungus with a prominent cup-shaped base; differs from edible Agaricus only in its white gills
 
Amanita rubescens
yellowish edible agaric that usually turns red when touched
 
Amanita verna
fungus similar to Amanita phalloides
 
amaranth
any of various plants of the genus Amaranthus having dense plumes of green or red flowers; often cultivated for food
 
amaranth
seed of amaranth plants used as a native cereal in Central and South America
 
Amaranthus caudatus
young leaves widely used as leaf vegetables; seeds used as cereal
 
Amaranthus graecizans
bushy plant of western United States
 
Amaranthus hybridus hypochondriacus
tall showy tropical American annual having hairy stems and long spikes of usually red flowers above leaves deeply flushed with purple; seeds often used as cereal
 
Amaranthus hypochondriacus
leaves sometimes used as potherbs; seeds used as cereal; southern United States to Central America; India and China
 
Amaranthus spinosus
erect annual of tropical central Asia and Africa having a pair of divergent spines at most leaf nodes
 
amaryllis
bulbous plant having showy white to reddish flowers
 
Amaryllis belladonna
amaryllis of South Africa often cultivated for its fragrant white or rose flowers
 
Ambrosia artemisiifolia
annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally
 
Ambrosia psilostachya
coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
 
Ambrosia trifida
a coarse annual with some leaves deeply and palmately three-cleft or five-cleft
 
ambrosia
any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
 
Amelanchier alnifolia
shrub or small tree of northwestern North America having fragrant creamy white flowers and small waxy purple-red fruits
 
Amelanchier bartramiana
open-growing shrub of eastern North America having pure white flowers and small waxy almost black fruits
 
ament
a cylindrical spikelike inflorescence
 
American aloe
tropical American plants with basal rosettes of fibrous sword-shaped leaves and flowers in tall spikes; some cultivated for ornament or for fiber
 
American angelica tree
small deciduous clump-forming tree or shrub of eastern United States
 
American arborvitae
small evergreen of eastern North America having tiny scalelike leaves on flattened branchlets
 
American basswood
large American shade tree with large dark green leaves and rounded crown
 
American bittersweet
twining shrub of North America having yellow capsules enclosing scarlet seeds
 
American crab apple
medium-sized tree of the eastern United States having pink blossoms and small yellow fruit
 
American cranberry bush
deciduous North American shrub or small tree having three-lobed leaves and red berries
 
American dewberry
North American dewberry
 
American dog violet
violet of eastern North America having pale violet to white flowers
 
American featherfoil
a featherfoil of the eastern United States with submerged spongy inflated flower stalks and white flowers
 
American fly honeysuckle
erect deciduous North American shrub with yellow-white flowers
 
American gentian
any of various tall perennial herbs constituting the genus Frasera; widely distributed in warm dry upland areas of California, Oregon, and Washington
 
American grey birch
medium-sized birch of eastern North America having white or pale grey bark and valueless wood; occurs often as a second-growth forest tree
 
American hellebore
North American plant having large leaves and yellowish green flowers growing in racemes; yields a toxic alkaloid used medicinally
 
American lotus
water lily of eastern North America having pale yellow blossoms and edible globular nutlike seeds
 
American maidenhair fern
hardy palmately branched North American fern with divergent recurved branches borne on lustrous dark reddish stipes
 
American mountain ash
a variety of mountain ash
 
American oil palm
palm of Central and South America
 
American pasqueflower
short hairy perennial with early spring blue-violet or lilac flowers; North America and Siberia
 
American quaking aspen
slender aspen native to North America
 
American red elder
common North American shrub or small tree
 
American red plum
wild plum trees of eastern and central North America having red-orange fruit with yellow flesh
 
American spicebush
deciduous shrub of the eastern United States having highly aromatic leaves and bark and yellow flowers followed by scarlet or yellow berries
 
American spikenard
unarmed woody rhizomatous perennial plant distinguished from wild sarsaparilla by more aromatic roots and panicled umbels; southeastern North America to Mexico
 
American star grass
perennial star grass of North America
 
American sweet chestnut
large tree found from Maine to Alabama
 
American turkey oak
small slow-growing deciduous shrubby tree of dry sandy barrens of southeastern United States having leaves with bristle-tipped lobes resembling turkey's toes
 
American watercress
of southwestern Europe; cultivated in Florida
 
American white birch
small American birch with peeling white bark often worked into e.g. baskets or toy canoes
 
American white oak
large slow-growing deciduous tree of the eastern United States having stout spreading branches and leaves with usually 7 rounded lobes; yields strong and durable hard wood
 
American white pine
tall-growing pine of eastern North America; bark is brown with longitudinal fissures when mature; valued as a timber tree
 
Amianthum muscaetoxicum
all parts of plant are highly toxic; bulb pounded and used as a fly poison; sometimes placed in subfamily Melanthiaceae
 
ammobium
any plant of the genus Ammobium having yellow flowers and silvery foliage
 
Ammobium alatum
Australian plant widely cultivated for its beautiful silvery-white blooms with bright yellow centers on long winged stems
 
amorpha
any plant of the genus Amorpha having odd-pinnate leaves and purplish spicate flowers
 
Amorpha californica
an erect to spreading hairy shrub of the Pacific coast of the United States having racemes of red to indigo flowers
 
Amorpha canescens
shrub of sandy woodlands and stream banks of western United States having hoary pinnate flowers and dull-colored racemose flowers; thought to indicate the presence of lead ore
 
Amorpha fruticosa
dense shrub of moist riverbanks and flood plains of the eastern United States having attractive fragrant foliage and dense racemes of dark purple flowers
 
amorphophallus
any plant of the genus Amorphophallus
 
Amorphophallus paeonifolius
putrid-smelling aroid of southeastern Asia (especially the Philippines) grown for its edible tuber
 
Amorphophallus rivieri
foul-smelling somewhat fleshy tropical plant of southeastern Asia cultivated for its edible corms or in the greenhouse for its large leaves and showy dark red spathe surrounding a large spadix
 
Amorphophallus titanum
malodorous tropical plant having a spathe that resembles the corolla of a morning glory and attains a diameter of several feet
 
Amphicarpaea bracteata
vine widely distributed in eastern North America producing racemes of purple to maroon flowers and abundant (usually subterranean) edible one-seeded pods resembling peanuts
 
amphitropous ovule
a partly inverted ovule turned back 90 degrees on its stalk
 
amplexicaul leaf
a leaf with its base clasping the stem
 
Amsinckia grandiflora
annual of the western United States having large coiled flower spikes; a threatened species
 
Amsinckia intermedia
annual of western United States with coiled spikes of yellow-orange coiled flowers
 
Amsonia tabernaemontana
subshrubs of southeastern United States forming slow-growing clumps and having blue flowers in short terminal cymes
 
Amygdalus communis
small bushy deciduous tree native to Asia and North Africa having pretty pink blossoms and highly prized edible nuts enclosed in a hard green hull; cultivated in southern Australia and California
 
Amygdalus communis amara
almond trees having white blossoms and poisonous nuts yielding an oil used for flavoring and for medicinal purposes
 
Anacardium occidentale
tropical American evergreen tree bearing kidney-shaped nuts that are edible only when roasted
 
Anacyclus pyrethrum
a small Mediterranean plant containing a volatile oil once used to relieve toothache
 
Anadenanthera colubrina
Brazilian shrub having twice-pinnate leaves and small spicate flowers followed by flat or irregularly torulose pods; sometimes placed in genus Piptadenia
 
Anagallis arvensis
herb with scarlet or white or purple blossoms that close at approach of rainy weather
 
Anagallis tenella
small creeping European herb having delicate pink flowers
 
Anagyris foetida
shrub with trifoliate leaves and yellow flowers followed by backward curving seed pods; leaves foetid when crushed
 
Ananas comosus
a tropical American plant bearing a large fleshy edible fruit with a terminal tuft of stiff leaves; widely cultivated in the tropics
 
Anaphalis margaritacea
an American everlasting having foliage with soft wooly hairs and corymbose heads with pearly white bracts
 
Anastatica hierochuntica
small grey Asiatic desert plant bearing minute white flowers that rolls up when dry and expands when moist
 
anatropous ovule
a completely inverted ovule turned back 180 degrees on its stalk
 
anchusa
any of various Old World herbs of the genus Anchusa having one-sided clusters of trumpet-shaped flowers
 
Anchusa capensis
anchusa of southern Africa having blue flowers with white throats
 
Anchusa officinalis
perennial or biennial herb cultivated for its delicate usually blue flowers
 
Anchusa riparia
anchusa of southern Africa having blue to red-purple flowers
 
Andaman redwood
mottled curly-grained wood of Pterocarpus indicus
 
andelmin
any of several tropical American trees of the genus Andira
 
Andira inermis
tree with shaggy unpleasant-smelling toxic bark and yielding strong durable wood; bark and seeds used as a purgative and vermifuge and narcotic
 
androecium
a male gametoecium
 
andromeda
any of several shrubs of the genus Andromeda having leathery leaves and clusters of small flowers
 
Andromeda glaucophylla
wiry evergreen shrub having pendent clusters of white or pink flowers; of wet acidic areas in Arctic and Canada to northeastern United States
 
Andromeda polifolia
erect to procumbent evergreen shrub having pendent clusters of white or pink flowers; of sphagnum peat bogs and other wet acidic areas in northern Europe
 
Andropogon gerardii
tall grass with smooth bluish leaf sheaths grown for hay in the United States
 
Andropogon virginicus
tall tufted grass of southeastern United States
 
andryala
any plant of the genus Andryala having milky sap and heads of bright yellow flowers
 
Anemia adiantifolia
fern of Florida and West Indies and Central America with rhizome densely clad in grown hairs
 
Anemone Canadensis
common summer-flowering woodland herb of Labrador to Colorado
 
Anemone cylindrica
a common North American anemone with cylindrical fruit clusters resembling thimbles
 
Anemone nemorosa
European anemone with solitary white flowers common in deciduous woodlands
 
Anemone quinquefolia
common anemone of eastern North America with solitary pink-tinged white flowers
 
Anemone riparia
thimbleweed of northern North America
 
Anemone sylvestris
Eurasian herb with solitary nodding fragrant white flowers
 
Anemone tetonensis
silky-foliaged herb of the Rocky Mountains with bluish-white flowers
 
anemone
any woodland plant of the genus Anemone grown for its beautiful flowers and whorls of dissected leaves
 
Anemonella thalictroides
woodland flower native to eastern North America having cup-shaped flowers reminiscent of anemone but more delicate
 
Anemopsis californica
stoloniferous herb of southwestern United States and Mexico having a pungent rootstock and small spicate flowers with white bracts suggesting an anemone
 
Anethum graveolens
aromatic Old World herb having aromatic threadlike foliage and seeds used as seasoning
 
Angelica Archangelica
a biennial cultivated herb; its stems are candied and eaten and its roots are used medicinally
 
Angelica sylvestris
European herb with compound leaves and white flowers; adventive on Cape Breton Island
 
angelica
any of various tall and stout herbs of the genus Angelica having pinnately compound leaves and small white or greenish flowers in compound umbels
 
angiocarp
tree bearing fruit enclosed in a shell or involucre or husk
 
Angiopteris evecta
highly variable species of very large primitive ferns of the Pacific tropical areas with high rainfall
 
angiosperm
plants having seeds in a closed ovary
 
angiospermous tree
any tree having seeds and ovules contained in the ovary
 
angiospermous yellowwood
any of various angiospermous trees having yellow wood
 
angostura
the bitter bark of a South American tree; used in medicines and liqueurs and bitters
 
angrecum
any of various spectacular orchids of the genus Angraecum having dark green leathery leaves and usually nocturnally scented white or ivory flowers
 
Anigozanthus manglesii
sedgelike spring-flowering herb having clustered flowers covered with woolly hairs; Australia
 
anise tree
any of several evergreen shrubs and small trees of the genus Illicium
 
Annona cherimola
small tropical American tree bearing round or oblong fruit
 
Annona diversifolia
tropical American tree grown in southern United States having a whitish pink-tinged fruit
 
Annona glabra
small evergreen tree of tropical America with edible fruit; used chiefly as grafting stock
 
Annona muricata
small tropical American tree bearing large succulent slightly acid fruit
 
Annona reticulata
small tropical American tree bearing a bristly heart-shaped acid tropical fruit
 
Annona squamosa
tropical American tree bearing sweet pulpy fruit with thick scaly rind and shiny black seeds
 
annual
(botany) a plant that completes its entire life cycle within the space of a year
 
annual salt-marsh aster
a variety of aster
 
annulus
(Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar
 
Annunciation lily
lily of eastern Mediterranean and the Balkans with broad funnel-shaped white flowers
 
Anogramma leptophylla
small short-lived fern of Central and South America
 
Antennaria dioica
low-growing perennial herb having leaves with whitish down and clusters of small white flowers
 
Antennaria plantaginifolia
North American perennial propagated by means of runners
 
Anthemis arvensis
European white-flowered weed naturalized in North America
 
Anthemis cotula
widespread rank-smelling weed having white-rayed flower heads with yellow discs
 
Anthemis tinctoria
Eurasian perennial herb with hairy divided leaves and yellow flowers; naturalized in North America
 
anther
the part of the stamen that contains pollen; usually borne on a stalk
 
Anthericum torreyi
plant having basal grasslike leaves and a narrow open cluster of starlike yellowish-orange flowers atop a leafless stalk; southwestern United States; only species of Anthericum growing in North America
 
antheridiophore
gametophore bearing antheridia as in certain mosses and liverworts
 
antheridium
the male sex organ of spore-producing plants; produces antherozoids; equivalent to the anther in flowers
 
antherozoid
a motile male gamete of a plant such as an alga or fern or gymnosperm
 
Anthriscus cereifolium
aromatic annual Old World herb cultivated for its finely divided and often curly leaves for use especially in soups and salads
 
Anthriscus sylvestris
coarse erect biennial Old World herb introduced as a weed in eastern North America
 
Anthurium scherzerianum
commonly cultivated anthurium having bright scarlet spathe and spadix
 
anthurium
any of various tropical American plants cultivated for their showy foliage and flowers
 
Anthyllis barba-jovis
silvery hairy European shrub with evergreen foliage and pale yellow flowers
 
Anthyllis vulneraria
perennial Eurasian herb having heads of red or yellow flowers and common in meadows and pastures; formerly used medicinally for kidney disorders
 
Antirrhinum coulterianum
California plant with slender racemes of white flowers
 
Antirrhinum filipes
southwestern United States plant with yellow flowers on stems that twist and twine through other vegetation
 
Apalachicola rosemary
small shrub of Apalachicola River area in southeastern United States having highly aromatic pinkish flowers; a threatened species
 
apetalous flower
flower having no petals
 
apical placentation
where one or few ovules develop at the top of a simple or compound ovary
 
Apios americana
a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans
 
Apium graveolens
herb of Europe and temperate Asia
 
Apium graveolens dulce
widely cultivated herb with aromatic leaf stalks that are eaten raw or cooked
 
Apium graveolens rapaceum
grown for its thickened edible aromatic root
 
Aplectrum hyemale
North American orchid bearing a single leaf and yellowish-brown flowers
 
Apocynum androsaemifolium
North American perennial having pinkish flowers in loose cymes; used in folk medicine for pain or inflammation in joints
 
Apocynum cannabinum
Canadian dogbane yielding a tough fiber used as cordage by Native Americans; used in folk medicine for pain or inflammation in joints
 
apomict
a plant that reproduces or is reproduced by apomixis
 
apophysis
(botany) a natural swelling or enlargement: at the base of the stalk or seta in certain mosses or on the cone scale of certain conifers
 
Aporocactus flagelliformis
commonly cultivated tropical American cactus having slender creeping stems and very large showy crimson flowers that bloom for several days
 
apothecium
a cuplike ascocarp in many lichens and ascomycetous fungi
 
apple nut
nutlike seed of a South American palm; the hard white shell takes a high polish and is used for e.g. buttons
 
apple tree
any tree of the genus Malus especially those bearing firm rounded edible fruits
 
applewood
wood of any of various apple trees of the genus Malus
 
apricot
Asian tree having clusters of usually white blossoms and edible fruit resembling the peach
 
aquatic
a plant that lives in or on water
 
aquatic fern
ferns that grow in water
 
aquatic plant
a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth
 
aquilege
a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains
 
Aquilegia canadensis
columbine of eastern North America having long-spurred red flowers
 
Aquilegia scopulorum calcarea
columbine of the Rocky Mountains having long-spurred blue flowers
 
Aquilegia vulgaris
common European columbine having variously colored (white or blue to purple or red) short-spurred flowers; naturalized in United States
 
Arabidopsis lyrata
a small noninvasive cross-pollinating plant with white flowers; closely related to Arabidopsis thaliana
 
Arabidopsis thaliana
a small invasive self-pollinating weed with small white flowers; much studied by plant geneticists; the first higher plant whose complete genome sequence was described
 
Arabis Canadensis
North American rock cress having very long curved pods
 
Arabis turrita
European cress having stiff erect stems; sometimes placed in genus Turritis
 
Arachis hypogaea
widely cultivated American plant cultivated in tropical and warm regions; showy yellow flowers on stalks that bend over to the soil so that seed pods ripen underground
 
aralia
any of various plants of the genus Aralia; often aromatic plants having compound leaves and small umbellate flowers
 
Aralia hispida
bristly herb of eastern and central North America having black fruit and medicinal bark
 
Aralia nudicaulis
common perennial herb having aromatic roots used as a substitute for sarsaparilla; central and eastern North America
 
araucaria
any of several tall South American or Australian trees with large cones and edible seeds
 
Araucaria araucana
large Chilean evergreen conifer having intertwined branches and bearing edible nuts
 
Araucaria bidwillii
Australian conifer bearing two-inch seeds tasting like roasted chestnuts; among the aborigines the tree is hereditary property protected by law
 
Araucaria columnaris
very tall evergreen of New Caledonia and the New Hebrides similar to norfolk island pine
 
Araucaria cunninghamii
pine of Australia and New Guinea; yields a valuable light even-textured wood
 
Araucaria heterophylla
evergreen of Australia and Norfolk Island in the South Pacific
 
Araujia sericofera
robust twining shrub having racemes of fragrant white or pink flowers with flat spreading terminal petals that trap nocturnal moths and hold them until dawn
 
arbor
tree (as opposed to shrub)
 
arborescent plant
having the shape or characteristics of a tree
 
arborvitae
any of several Asian and North American conifers of the genera Thuja and Thujopsis
 
arbutus
any of several evergreen shrubs of the genus Arbutus of temperate Europe and America
 
Arbutus menziesii
evergreen tree of the Pacific coast of North America having glossy leathery leaves and orange-red edible berries; wood used for furniture and bark for tanning
 
Arceuthobium pusillum
small herb with scalelike leaves on reddish-brown stems and berrylike fruits; parasitic on spruce and larch trees
 
archegonium
a female sex organ occurring in mosses, ferns, and most gymnosperms
 
archespore
primitive cell or group of cells from which a mother cell develops
 
archil
any of various lecanoras that yield the dye archil
 
Arctium lappa
burdock having heart-shaped leaves found in open woodland, hedgerows and rough grassland of Europe (except extreme N) and Asia Minor; sometimes cultivated for medicinal and culinary use
 
Arctium minus
a plant that is ubiquitous in all but very acid soil; found in most of Europe and North Africa
 
Arctostaphylos alpina
deciduous creeping shrub bright red in autumn having black or blue-black berries; alpine and circumpolar
 
Arctostaphylos andersonii
erect California shrub having leaves with heart-shaped lobes at the base
 
Arctostaphylos manzanita
erect treelike shrub forming dense thickets and having drooping panicles of white or pink flowers and red berrylike drupes; California
 
Arctostaphylos tomentosa
erect openly branched California shrub whose twigs are woolly when young
 
Arctostaphylos uva-ursi
evergreen mat-forming shrub of North America and northern Eurasia having small white flowers and red berries; leaves turn red in autumn
 
Arctotis stoechadifolia
bushy perennial of South Africa with white or violet flowers; in its native region often clothes entire valley sides in a sheet of color
 
Ardisia crenata
shrub with coral-red berries; Japan to northern India
 
Ardisia escallonoides
tropical American shrub or small tree with brown wood and dark berries
 
areca
any of several tall tropical palms native to southeastern Asia having egg-shaped nuts
 
Areca catechu
southeastern Asian palm bearing betel nuts (scarlet or orange single-seeded fruit with a fibrous husk)
 
Arenaria caroliniana
deep-rooted perennial of southeastern United States
 
Arenaria groenlandica
boreal or alpine sandwort
 
Arenaria peploides
perennial succulent herb with small solitary axillary or terminal flowers
 
Arenaria serpyllifolia
Eurasian annual sprawling plant naturalized throughout North America
 
Arenaria stricta
low perennial tufted plant of southeastern North America
 
Arenga pinnata
Malaysian feather palm with base densely clothed with fibers; yields a sweet sap used in wine and trunk pith yields sago
 
arethusa
any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers
 
Arethusa bulbosa
a bog orchid with usually a solitary fragrant magenta pink blossom with a wide gaping corolla; Canada
 
Argemone mexicana
annual herb with prickly stems and large yellow flowers; southern United States to West Indies and Mexico
 
argemone
any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America
 
Argyroxiphium sandwicense
low-growing plant found only in volcanic craters on Hawaii having rosettes of narrow pointed silver-green leaves and clusters of profuse red-purple flowers on a tall stem
 
aril
fleshy and usually brightly colored cover of some seeds that develops from the ovule stalk and partially or entirely envelops the seed
 
Ariocarpus fissuratus
usually unbranched usually spineless cactus covered with warty tubercles and having magenta flowers and white or green fruit; resembles the related mescal; northeastern Mexico and southwestern United States
 
Arisaema dracontium
early spring-flowering plant of eastern North America resembling the related jack-in-the-pulpit but having digitate leaves, slender greenish yellow spathe and elongated spadix
 
Arisaema triphyllum
common American spring-flowering woodland herb having sheathing leaves and an upright club-shaped spadix with overarching green and purple spathe producing scarlet berries
 
Arisarum vulgare
tuberous perennial having a cowl-shaped maroon or violet-black spathe; Mediterranean; Canaries; Azores
 
Aristolochia clematitis
creeping plant having curving flowers thought to resemble fetuses; native to Europe; naturalized Great Britain and eastern North America
 
Aristolochia macrophylla
hardy deciduous vine having large leaves and flowers with the calyx tube curved like the bowl of a pipe
 
Aristolochia serpentaria
birthwort of the eastern United States woodlands
 
Arizona wild cotton
shrub of southern Arizona and Mexico
 
Armeria maritima
tufted thrift of seacoasts and mountains of north temperate zone; occasionally grown as a ground cover
 
Armillaria caligata
fungus with a brown cap and white gills and a membranous ring halfway up the stalk
 
Armillaria ponderosa
a large white mushroom that develops brown stains as it ages; gills are white; odor is spicy and aromatic; collected commercially for oriental cooking the Pacific Northwest
 
Armillaria zelleri
a large fungus with viscid cap that dries and turns brown with age; gills are off-white
 
Armillariella mellea
a honey-colored edible mushroom commonly associated with the roots of trees in late summer and fall; do not eat raw
 
Armoracia rusticana
coarse Eurasian plant cultivated for its thick white pungent root
 
arnica
any of various rhizomatous usually perennial plants of the genus Arnica
 
arnica
used especially in treating bruises
 
Arnica cordifolia
wildflower with heart-shaped leaves and broad yellow flower heads; of alpine areas west of the Rockies from Alaska to southern California
 
Arnica montana
herb of pasture and open woodland throughout most of Europe and western Asia having orange-yellow daisylike flower heads that when dried are used as a stimulant and to treat bruises and swellings
 
Arnoseris minima
small European herb with small yellow flowers
 
aroid
any plant of the family Araceae; have small flowers massed on a spadix surrounded by a large spathe
 
aromatic aster
a variety of aster
 
Arrhenatherum elatius
coarse perennial Eurasian grass resembling oat; found on roadside verges and rough grassland and in hay meadows; introduced in North America for forage
 
arrow arum
an aquatic plant of the genus Peltandra; North America
 
arrow leaved aster
a variety of aster
 
Artemis pontica
European wormwood; minor source of absinthe
 
Artemis spinescens
a perennial that is valuable as sheep forage in the United States
 
artemisia
any of various composite shrubs or herbs of the genus Artemisia having aromatic green or greyish foliage
 
Artemisia abrotanum
shrubby European wormwood naturalized in North America; sometimes used in brewing beer
 
Artemisia absinthium
aromatic herb of temperate Eurasia and North Africa having a bitter taste used in making the liqueur absinthe
 
Artemisia annua
wormwood of southeastern Europe to Iran
 
Artemisia californica
low ashy-grey California shrub
 
Artemisia campestris
European wormwood similar to common wormwood in its properties
 
Artemisia dracunculus
aromatic perennial of southeastern Russia
 
Artemisia filifolia
silver-haired shrub of central and southern United States and Mexico; a troublesome weed on rangelands
 
Artemisia frigida
silky-leaved aromatic perennial of dry northern parts of the northern hemisphere; has tawny florets
 
Artemisia ludoviciana
perennial cottony-white herb of southwestern United States
 
Artemisia stelleriana
herb with greyish leaves found along the east coast of North America; used as an ornamental plant
 
Artemisia vulgaris
European tufted aromatic perennial herb having hairy red or purple stems and dark green leaves downy white below and red-brown florets
 
arthrospore
one of a string of thick walled vegetative resting cells formed by some algae and fungi
 
arthrospore
a body that resembles a spore but is not an endospore; produced by some bacteria
 
Artocarpus communis
native to Pacific islands and having edible fruit with a texture like bread
 
Artocarpus heterophyllus
East Indian tree cultivated for its immense edible fruit and seeds
 
Artocarpus odoratissima
Philippine tree similar to the breadfruit tree bearing edible fruit
 
arum
starch resembling sago that is obtained from cuckoopint root
 
Arum maculatum
common European arum with lanceolate spathe and short purple spadix; emerges in early spring; source of a starch called arum
 
Arum palaestinum
ornamental plant of Middle East cultivated for its dark purple spathe
 
Arundinaria gigantea
tall grass of southern United States growing in thickets
 
Arundinaria tecta
small cane of watery or moist areas in southern United States
 
Arundo donax
large rhizomatous perennial grasses found by riversides and in ditches having jointed stems and large grey-white feathery panicles
 
Asarum canadense
deciduous low-growing perennial of Canada and eastern and central United States
 
Asarum europaeum
thick creeping evergreen herb of western Europe
 
Asarum shuttleworthii
wild ginger having persistent heart-shaped pungent leaves; West Virginia to Alabama
 
Asarum virginicum
evergreen low-growing perennial having mottled green and silvery-grey heart-shaped pungent leaves; Virginia to South Carolina
 
asclepiad
any plant of the family Asclepiadaceae
 
Asclepias albicans
tall herb with leafless white waxy stems and whitish starlike flowers; southwestern United States
 
Asclepias curassavica
tropical herb having orange-red flowers followed by pods suggesting a swallow with outspread wings; a weed throughout the tropics
 
Asclepias exaltata
milkweed of the eastern United States with leaves resembling those of pokeweed
 
Asclepias incarnata
densely branching perennial of the eastern United States with white to crimson or purple flowers
 
Asclepias meadii
milkweed of central North America; a threatened species
 
Asclepias purpurascens
perennial of eastern North America having pink-purple flowers
 
Asclepias speciosa
milkweed of southern North America having large starry purple and pink flowers
 
Asclepias subverticillata
milkweed of southwestern United States and Mexico; poisonous to livestock
 
Asclepias tuberosa
erect perennial of eastern and southern United States having showy orange flowers
 
Asclepias verticillata
milkweed of the eastern United States with narrow leaves in whorls and greenish-white flowers
 
ascocarp
mature fruiting body of an ascomycetous fungus
 
ascolichen
a lichen in which the fungus component is an ascomycete
 
ascoma
an ascocarp having the spore-bearing layer of cells (the hymenium) on a broad disklike receptacle
 
ascomycete
any fungus of the class Ascomycetes (or subdivision Ascomycota) in which the spores are formed inside an ascus
 
ascospore
sexually produced fungal spore formed within an ascus
 
ascus
saclike structure in which ascospores are formed through sexual reproduction of ascomycetes
 
ash
strong elastic wood of any of various ash trees; used for furniture and tool handles and sporting goods such as baseball bats
 
ash
any of various deciduous pinnate-leaved ornamental or timber trees of the genus Fraxinus
 
ash-key
winged seed of the ash tree
 
Asimina triloba
small tree native to the eastern United States having oblong leaves and fleshy fruit
 
Aspalathus cedcarbergensis
South African shrub having flat acuminate leaves and yellow flowers; leaves are aromatic when dried and used to make an herbal tea
 
Asparagus asparagoides
fragile twining plant of South Africa with bright green flattened stems and glossy foliage popular as a floral decoration
 
Asparagus officinales
plant whose succulent young shoots are cooked and eaten as a vegetable
 
Asparagus setaceous
a fernlike plant native to South Africa
 
aspen
any of several trees of the genus Populus having leaves on flattened stalks so that they flutter in the lightest wind
 
Aspergillus fumigatus
a mold causing aspergillosis in birds and man
 
Asperula odorata
Old World fragrant stoloniferous perennial having small white flowers and narrow leaves used as flavoring and in sachets; widely cultivated as a ground cover; in some classifications placed in genus Asperula
 
Asperula tinctoria
creeping European perennial having red or pinkish-white flowers and red roots sometimes used as a substitute for madder in dyeing
 
asphodel
any of various chiefly Mediterranean plants of the genera Asphodeline and Asphodelus having linear leaves and racemes of white or pink or yellow flowers
 
Asphodeline lutea
asphodel with leafy stem and fragrant yellow flowers
 
Aspidistra elatio
evergreen perennial with large handsome basal leaves; grown primarily as a foliage houseplant
 
Asplenium adiantum-nigrum
spleenwort of Europe and Africa and Asia having pinnate fronds and yielding an astringent
 
Asplenium billotii
a spleenwort of western Europe
 
Asplenium montanum
a spleenwort of eastern North America
 
Asplenium nidus
tropical Old World or Australian epiphytic fern frequently forming tufts in tree crotches
 
Asplenium pinnatifidum
a spleenwort of eastern and southern United States
 
Asplenium platyneuron
common North American fern with polished black stripes
 
Asplenium ruta-muraria
small delicate spleenwort found on a steep slope (as a wall or cliff) of Eurasia and North America
 
Asplenium trichomanes
small rock-inhabiting fern of northern temperate zone and Hawaii with pinnate fronds
 
Asplenium viride
a small fern with slim green fronds; widely distributed in cool parts of northern hemisphere
 
aster
any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers
 
Aster acuminatus
North American perennial with apparently whorled leaves and showy white purple-tinged flowers
 
Aster arenosus
common North American perennial with heathlike foliage and small white flower heads
 
Aster cordifolius
perennial wood aster of eastern North America
 
Aster divaricatus
rhizomatous perennial wood aster of eastern North America with white flowers
 
Aster dumosus
stiff perennial of the eastern United States having small linear leaves and numerous tiny white flower heads
 
Aster ericoides
common much-branched North American perennial with heathlike foliage and small starry white flowers
 
Aster falcatus
perennial of western North America having white flowers
 
Aster linarifolius
wiry tufted perennial of the eastern United States with stiff erect rough stems, linear leaves and large violet flowers
 
Aster macrophyllus
tufted perennial wood aster of North America; naturalized in Europe
 
Aster novae-angliae
common perennial of eastern North America having showy purplish flowers; a parent of the Michaelmas daisy
 
Aster novi-belgii
North American perennial herb having small autumn-blooming purple or pink or white flowers; widely naturalized in Europe
 
Aster ptarmicoides
tufted rigid North American perennial with loose clusters of white flowers
 
Aster tripolium
a common European aster that grows in salt marshes
 
Aster turbinellis
violet-flowered perennial aster of central United States having solitary heads
 
asterid dicot family
family of more or less advanced dicotyledonous herbs and some trees and shrubs
 
asterid dicot genus
genus of more or less advanced dicotyledonous herbs and some trees and shrubs
 
astilbe
any plant of the genus Astilbe having compound leaves and showy panicles of tiny colorful flowers
 
Astilbe biternata
North American astilbe with panicles of creamy white flowers
 
Astilbe chinensis pumila
mat-forming evergreen Asiatic plant with finely cut leaves and small pink to burgundy flowers; grown as ground cover
 
Astilbe japonica
a Japanese shrub that resembles members of the genus Spiraea; widely cultivated in many varieties for its dense panicles of flowers in many colors; often forced by florists for Easter blooming
 
Astragalus alpinus
perennial of mountainous areas of Eurasia and North America
 
Astragalus danicus
perennial of southern and western Europe having dense racemes of purple or violet flowers
 
Astragalus glycyphyllos
European perennial
 
Astrantia major
European herb with aromatic roots and leaves in a basal tuft and showy compound umbels of white to rosy flowers
 
astrantia
any plant of the genus Astrantia
 
Astreus hygrometricus
a common species of earthstar widely distributed in sandy soil; the gleba is a pale tan
 
Astreus pteridis
the largest earthstar; the fruiting body can measure 15 cm across when the rays are expanded
 
Astronium fraxinifolium
tall tropical American timber tree especially abundant in eastern Brazil; yields hard strong durable zebrawood with straight grain and dark strips on a pinkish to yellowish ground; widely used for veneer and furniture and heavy construction
 
Athrotaxis selaginoides
evergreen of Tasmanian mountains having sharp-pointed leaves that curve inward
 
Athyrium distentifolium
a lady fern with deeply cut leaf segments; found in the Rocky Mountains
 
Athyrium filix-femina
most widely grown fern of the genus Athyrium for its delicate foliage
 
Athyrium thelypteroides
fern with elongate silvery outgrowths enclosing the developing spores
 
Atriplex hortensis
Asiatic plant resembling spinach often used as a potherb; naturalized in Europe and North America
 
Atriplex hymenelytra
handsome low saltbush of arid southwestern United States and Mexico having blue-green prickly-edged leaves often used for Christmas decoration
 
Atriplex lentiformis
spiny shrub with silvery-scurfy foliage of alkaline plains of southwestern United States and Mexico
 
Atropa belladonna
perennial Eurasian herb with reddish bell-shaped flowers and shining black berries; extensively grown in United States; roots and leaves yield atropine
 
Attalea funifera
Brazilian palm yielding fibers used in making ropes, mats, and brushes
 
Aureolaria pedicularia
multi-stemmed North American annual having solitary axillary dark golden-yellow flowers resembling those of the foxglove; sometimes placed in genus Gerardia
 
Aureolaria virginica
sparsely branched North American perennial with terminal racemes of bright yellow flowers resembling those of the foxglove; sometimes placed in genus Gerardia
 
Auricularia auricula
widely distributed edible fungus shaped like a human ear and growing on decaying wood
 
Australian grass tree
any of several Australian evergreen perennials having short thick woody stems crowned by a tuft of grasslike foliage and yielding acaroid resins
 
Australian grass tree
stout Australian shrub with narrow leaves crowded at ends of branches and terminal clusters of white or pink flowers
 
Australian hare's foot
a hare's-foot fern of the genus Davallia
 
Australian heath
any heathlike plant of the family Epacridaceae; most are of the Australian region
 
Australian honeysuckle
shrubby tree with silky foliage and spikes of cylindrical yellow nectarous flowers
 
Australian nettle tree
any of several tall Australian trees of the genus Laportea
 
Australian pitcher plant
a carnivorous perennial herb having a green pitcher and hinged lid both with red edges; western Australia
 
Austrocedrus chilensis
a small South American evergreen having coppery bark and pretty foliage
 
Austrotaxus spicata
large yew native to New Caledonia; cultivated in eastern Australia and New Zealand and Hawaii
 
autophyte
plant capable of synthesizing its own food from simple organic substances
 
Avena barbata
oat of southern Europe and southwestern Asia
 
Avena fatua
common in meadows and pastures
 
Avena sativa
widely cultivated in temperate regions for its edible grains
 
Avene sterilis
Mediterranean oat held to be progenitor of modern cultivated oat
 
avens
any of various perennials of the genus Geum having usually pinnate basal leaves and variously colored flowers
 
Averrhoa bilimbi
East Indian evergreen tree bearing very acid fruit
 
Averrhoa carambola
East Indian tree bearing deeply ridged yellow-brown fruit
 
Avicennia marina
a mangrove of the West Indies and the southern Florida coast; occurs in dense thickets and has numerous short roots that bend up from the ground
 
Avicennia officinalis
a small to medium-sized tree growing in brackish water especially along the shores of the southwestern Pacific
 
awn
slender bristlelike appendage found on the bracts of grasses
 
axil
the upper angle between an axis and an offshoot such as a branch or leafstalk
 
axile placentation
ovules are borne at or around the center of a compound ovary on an axis formed from joined septa
 
axis
the main stem or central part about which plant organs or plant parts such as branches are arranged
 
Ayapana triplinervis
low spreading tropical American shrub with long slender leaves used to make a mildly stimulating drink resembling tea; sometimes placed in genus Eupatorium
 
Azadirachta indica
large semi-evergreen tree of the East Indies; trunk exudes a tenacious gum; bitter bark used as a tonic; seeds yield an aromatic oil; sometimes placed in genus Melia
 
azalea
any of numerous ornamental shrubs grown for their showy flowers of various colors
 
azure aster
a variety of aster
 
babacu oil
fatty oil from kernels of babassu nuts similar to coconut oil
 
babassu nut
hard-shelled nut of the babassu palm
 
Babylonian weeping willow
willow with long drooping branches and slender leaves native to China; widely cultivated as an ornamental
 
bacca
an indehiscent fruit derived from a single ovary having one or many seeds within a fleshy wall or pericarp: e.g. grape; tomato; cranberry
 
Baccharis halimifolia
a shrub of salt marshes of eastern and south central North America and West Indies; fruit is surrounded with white plumelike hairy tufts
 
Baccharis pilularis
widely spreading evergreen shrub of southwestern United States with flower heads in a leafy panicle
 
Baccharis viminea
California shrub with slender leafy shoots that are important browse for mule deer
 
balata
when dried yields a hard substance used e.g. in golf balls
 
Ballota nigra
ill-smelling European herb with rugose leaves and whorls of dark purple flowers
 
balm of Gilead
medium-sized fir of northeastern North America; leaves smell of balsam when crushed; much used for pulpwood and Christmas trees
 
balsa
strong lightweight wood of the balsa tree used especially for floats
 
balsam
any seed plant yielding balsam
 
balsam of Peru
dark brown syrupy balsam from the Peruvian balsam tree used especially in dressing wounds and treating certain skin diseases
 
balsam of tolu
aromatic yellowish brown balsam from the tolu balsam tree used especially in cough syrups
 
balsamroot
a plant of the genus Balsamorhiza having downy leaves in a basal rosette and yellow flowers and long balsam-scented taproots
 
bamboo
woody tropical grass having hollow woody stems; mature canes used for construction and furniture
 
bamboo
the hard woody stems of bamboo plants; used in construction and crafts and fishing poles
 
Bambusa vulgaris
extremely vigorous bamboo having thin-walled culms striped green and yellow; so widely cultivated that native area is uncertain
 
banana
any of several tropical and subtropical treelike herbs of the genus Musa having a terminal crown of large entire leaves and usually bearing hanging clusters of elongated fruits
 
baneberry
a poisonous berry of a plant of the genus Actaea
 
banksia
any shrub or tree of the genus Banksia having alternate leathery leaves apetalous yellow flowers often in showy heads and conelike fruit with winged seeds
 
Baptisia australis
wild indigo of the eastern United States having racemes of blue flowers
 
Baptisia lactea
erect or spreading herb having racemes of creamy white flowers; the eastern United States
 
Baptisia tinctoria
much-branched erect herb with bright yellow flowers; distributed from Massachusetts to Florida
 
Barbados-gooseberry vine
West Indian woody climber with spiny stems and numerous fragrant white flowers in panicles followed by small yellow to orange fruits
 
barberry
any of numerous plants of the genus Berberis having prickly stems and yellow flowers followed by small red berries
 
bark
tough protective covering of the woody stems and roots of trees and other woody plants
 
barley
cultivated since prehistoric times; grown for forage and grain
 
barleycorn
a grain of barley
 
barrel cactus
a cactus of the genus Ferocactus: unbranched barrel-shaped cactus having deep ribs with numerous spines and usually large funnel-shaped flowers followed by dry fruits
 
barrel cactus
any cactus of the genus Echinocactus; strongly ribbed and very spiny; southwestern United States to Brazil
 
basal placentation
where one or few ovules develop at the base of a simple or compound ovary
 
basidiocarp
the fruiting body of a basidiomycete which bears its spores on special cells
 
basidiolichen
a lichen in which the fungus component is a basidiomycete
 
basidiomycete
any of various fungi of the subdivision Basidiomycota
 
basidiospore
a sexually produced fungal spore borne on a basidium
 
basidium
a small club-shaped structure typically bearing four basidiospores at the ends of minute projections; unique to basidiomycetes
 
basil
any of several Old World tropical aromatic annual or perennial herbs of the genus Ocimum
 
bassine
coarse leaf fiber from palmyra palms used in making brushes and brooms
 
basswood
any of various deciduous trees of the genus Tilia with heart-shaped leaves and drooping cymose clusters of yellowish often fragrant flowers; several yield valuable timber
 
basswood
soft light-colored wood of any of various linden trees; used in making crates and boxes and in carving and millwork
 
bast
strong woody fibers obtained especially from the phloem of from various plants
 
bast
(botany) tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed; consists primarily of sieve tubes
 
bastard pimpernel
weedy plant having short dry chafflike leaves
 
Batis maritima
low-growing strong-smelling coastal shrub of warm parts of the New World having unisexual flowers in conelike spikes and thick succulent leaves
 
Bauhinia monandra
shrub or small tree of Dutch Guiana having clusters of pink flowers streaked with purple
 
Bauhinia variegata
small East Indian tree having orchid-like flowers and hard dark wood
 
bay grass
any of various grasses of the genus Eragrostis; specially useful for forage and for the prevention of erosion
 
bayberry tallow
a fragrant green wax obtained from the wax myrtle and used in making candles
 
beach grass
tough grasses with strong roots that can grow on exposed sandy shores
 
beak
a beaklike, tapering tip on certain plant structures
 
bean
any of various seeds or fruits that are beans or resemble beans
 
bean tree
any of several trees having seedpods as fruits
 
bean
any of various leguminous plants grown for their edible seeds and pods
 
beanstalk
stem of a bean plant
 
bearberry
chiefly evergreen subshrubs of northern to Arctic areas
 
beard
a tuft or growth of hairs or bristles on certain plants such as iris or grasses
 
bearded iris
any of numerous wild or cultivated irises with hairlike structures on the falls (the drooping sepals)
 
beardless iris
any of numerous wild or cultivated irises having no hairs on the drooping sepals (the falls)
 
Beaumontia grandiflora
evergreen woody twiner with large glossy leaves and showy corymbs of fragrant white trumpet-shaped flowers
 
Bechtel crab
derived from the Iowa crab and cultivated for its large double pink blossoms
 
bedder
an ornamental plant suitable for planting in a flowerbed
 
bedstraw
any of several plants of the genus Galium
 
beech fern
any fern of the genus Phegopteris having deeply cut triangular fronds
 
beech
any of several large deciduous trees with rounded spreading crowns and smooth grey bark and small sweet edible triangular nuts enclosed in burs; north temperate regions
 
beech
wood of any of various beech trees; used for flooring and containers and plywood and tool handles
 
beefwood
any of several Australian trees of the genus Casuarina yielding heavy hard red wood used in cabinetwork
 
beefwood
any of several heavy hard reddish chiefly tropical woods of the families Casuarinaceae and Proteaceae; some used for cabinetwork
 
beggar lice
Eurasian and North American plants having small prickly nutlets that stick to clothing
 
beggar lice
any of various tropical and subtropical plants having trifoliate leaves and rough sticky pod sections or loments
 
beggar's-ticks
any of several plants of the genus Bidens having yellow flowers and prickly fruits that cling to fur and clothing
 
begonia
any of numerous plants of the genus Begonia grown for their attractive glossy asymmetrical leaves and colorful flowers in usually terminal cymes or racemes
 
Begonia cheimantha
hybrid winter-blooming begonia grown for its many large pink flowers
 
Begonia cocchinea
South American fibrous-rooted begonias having prominent basal leaf lobes suggesting angels' wings and racemes of coral-red flowers
 
Begonia dregei
tuberous or semi-tuberous South African begonia having shallowly lobed ovate leaves and small white flowers
 
Begonia erythrophylla
rhizomatous begonia with roundish fleshy leaves reddish colored beneath
 
Begonia heracleifolia
rhizomatous begonia having leaves with pointed lobes suggestive of stars and pink flowers
 
Begonia rex
any of numerous usually rhizomatous hybrid begonias derived from an East Indian plant having rough-textured leaves patterned in silver and bronze and purple and red-brown with inconspicuous flowers
 
Begonia semperflorens
hybrid fibrous-rooted begonia having broad-ovate green to bronze-red leaves and small clusters of white or pink or red flowers; widely used as a bedding plant
 
Begonia socotrana
semi-tuberous begonia having peltate leaves and rose-pink flowers; Yemen
 
Begonia tuberhybrida
any of numerous hybrid begonias having tuberous roots and variously colored flowers
 
Belamcanda chinensis
garden plant whose capsule discloses when ripe a mass of seeds resembling a blackberry
 
bellflower
any of various plants of the genus Campanula having blue or white bell-shaped flowers
 
Bellis perennis
low-growing Eurasian plant with yellow central disc flowers and pinkish-white outer ray flowers
 
bellwort
any of various plants of the genus Uvularia having yellowish drooping bell-shaped flowers
 
bent
grass for pastures and lawns especially bowling and putting greens
 
Berberis canadensis
deciduous shrub of eastern North America whose leaves turn scarlet in autumn and having racemes of yellow flowers followed by ellipsoid glossy red berries
 
Berberis thunbergii
compact deciduous shrub having persistent red berries; widespread in cultivation especially for hedges
 
bergenia
any plant of the genus Bergenia; valued as an evergreen ground cover and for the spring blossoms
 
Bermuda buttercup
South African bulbous wood sorrel with showy yellow flowers
 
Bermuda maidenhair fern
delicate endemic Bermudian fern with creeping rootstock
 
berry
a small fruit having any of various structures, e.g., simple (grape or blueberry) or aggregate (blackberry or raspberry)
 
Berteroa incana
tall European annual with downy grey-green foliage and dense heads of small white flowers followed by hairy pods; naturalized in North America; sometimes a troublesome weed
 
Bertholletia excelsa
tall South American tree bearing brazil nuts
 
Bessera elegans
half-hardy Mexican herb cultivated for its drooping terminal umbels of showy red-and-white flowers
 
Besseya alpina
small pale plant with dense spikes of pale bluish-violet flowers; of high cold meadows from Wyoming and Utah to New Mexico
 
Beta vulgaris
biennial Eurasian plant usually having a swollen edible root; widely cultivated as a food crop
 
Beta vulgaris cicla
beet lacking swollen root; grown as a vegetable for its edible leaves and stalks
 
Beta vulgaris rubra
beet having a massively swollen red root; widely grown for human consumption
 
Beta vulgaris vulgaris
beet with a large yellowish root; grown chiefly as cattle feed
 
betel
a leaf of a vine from the betel pepper
 
Betula alleghaniensis
tree of eastern North America with thin lustrous yellow or grey bark
 
Betula lenta
common birch of the eastern United States having spicy brown bark yielding a volatile oil and hard dark wood used for furniture
 
Betula neoalaskana
Alaskan birch with white to pale brown bark
 
Betula nigra
birch of swamps and river bottoms throughout the eastern United States having reddish-brown bark
 
Betula pubescens
European birch with dull white to pale brown bark and somewhat drooping hairy branches
 
Bidens bipinnata
common bur marigold of the eastern United States
 
Bidens connata
bur marigold of eastern and northern United States and Canada common in wet pastures and meadows
 
Bidens trichosperma
North American bur marigold with large flowers
 
biennial
(botany) a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season
 
Bignonia capreolata
woody flowering vine of southern United States; stems show a cross in transverse section
 
bignoniad
any woody plant of the family Bignoniaceae
 
bijugate leaf
a pinnate leaf having two pairs of leaflets
 
billy buttons
any of various plants of the genus Craspedia grown for their downy foliage and globose heads of golden flowers; Australia and New Zealand
 
bilocular capsule
a capsule divided into two cells or compartments
 
bindweed
any of several vines of the genera Convolvulus and Calystegia having a twining habit
 
bipinnate leaf
a leaf having pinnate leaflets; as ferns
 
birch
hard close-grained wood of any of various birch trees; used especially in furniture and interior finishes and plywood
 
birch
any betulaceous tree or shrub of the genus Betula having a thin peeling bark
 
bird cherry
any of several small-fruited cherry trees frequented or fed on by birds
 
bird's-eye maple
maple wood having a wavy grain with eyelike markings
 
bird's-nest fungus
any of various fungi of the family Nidulariaceae having a cup-shaped body containing several egg-shaped structure enclosing the spores
 
Biscutalla laevigata
plant of southeastern Europe having yellow flowers like those of mustard and pods with open valves resembling bucklers
 
bishop's cap
any of various rhizomatous perennial herbs of the genus Mitella having a capsule resembling a bishop's miter
 
bitter almond oil
pale yellow essential oil obtained from bitter almonds by distillation from almond cake or meal
 
bitter cress
any of various herbs of the genus Cardamine, having usually pinnate leaves and racemes of white, pink or purple flowers; cosmopolitan except Antarctic
 
bitter pea
any of several spiny shrubs of the genus Daviesia having yellow flowers and triangular seeds; Australia
 
bitterwood tree
any of various trees or shrubs of the family Simaroubaceae having wood and bark with a bitter taste
 
black catechu
extract of the heartwood of Acacia catechu used for dyeing and tanning and preserving fishnets and sails; formerly used medicinally
 
black felt cup
a common name for a variety of Sarcosomataceae
 
black locust
strong stiff wood of a black-locust tree; very resistant to decay
 
black-eyed pea
fruit or seed of the cowpea plant
 
black-eyed Susan vine
tropical African climbing plant having yellow flowers with a dark purple center
 
black-stem spleenwort
fern of tropical America: from southern United States to West Indies and Mexico to Brazil
 
blackberry
bramble with sweet edible black or dark purple berries that usually do not separate from the receptacle
 
blackwood
very dark wood of any of several blackwood trees
 
blackwood
any of several hardwood trees yielding very dark-colored wood
 
bladder fern
any fern of the genus Cystopteris characterized by a hooded indusium or bladderlike membrane covering the sori
 
bladderpod
any of several hairy North American herbs having yellow racemose flowers and inflated pods
 
bladderpod
any of several plants of the genus Physaria having racemose yellow flowers and inflated pods
 
bladderpod
annual or perennial herbs with inflated seed pods; some placed in genus Lesquerella
 
bladderwort
any of numerous aquatic carnivorous plants of the genus Utricularia some of whose leaves are modified as small urn-shaped bladders that trap minute aquatic animals
 
blade
especially a leaf of grass or the broad portion of a leaf as distinct from the petiole
 
blastomycete
any of various yeastlike budding fungi of the genus Blastomyces; cause disease in humans and other animals
 
blazing star
any of various North American plants of the genus Liatris having racemes or panicles of small discoid flower heads
 
Blechnum spicant
fern with erect fronds of Europe and western North America; often cultivated for deer browse
 
Blephilia celiata
a variety of wood mint
 
Blephilia hirsuta
a variety of wood mint
 
bletia
any of various orchids of the genus Bletia having pseudobulbs and erect leafless racemes of large purple or pink flowers
 
Bletilla striata
Japanese orchid with white-striped leaves and slender erect racemes of rose to magenta flowers; often cultivated; sometimes placed in genus Bletia
 
Blighia sapida
widely cultivated in tropical and subtropical regions for its fragrant flowers and colorful fruits; introduced in Jamaica by William Bligh
 
blister
(botany) a swelling on a plant similar to that on the skin
 
blood lily
any of various deciduous or evergreen herbs of the genus Haemanthus; South Africa and Namibia
 
bloodleaf
any plant of the genus Iresine having colored foliage
 
bloodwort
any of various plants of the family Haemodoraceae; roots contain a deep red coloring matter
 
bloom
reproductive organ of angiosperm plants especially one having showy or colorful parts
 
bloomer
a flower that blooms in a particular way
 
Bloomeria crocea
California plant having grasslike leaves and showy orange flowers
 
blowball
any of several herbs of the genus Taraxacum having long tap roots and deeply notched leaves and bright yellow flowers followed by fluffy seed balls
 
blue curls
any of several plants of the genus Trichostema having whorls of small blue flowers
 
blue fig
the fruit of the Brisbane quandong tree
 
blue grass
any of various grasses of the genus Poa
 
Blue Mountain tea
goldenrod of eastern America having aromatic leaves from which a medicinal tea is made
 
blue-eyed grass
plant with grasslike foliage and delicate blue flowers
 
blueberry
any of numerous shrubs of the genus Vaccinium bearing blueberries
 
Bocconia frutescens
small Central American tree having loose racemes of purple-tinted green flowers
 
bog asphodel
either of two herbaceous rushlike bog plants having small yellow flowers and grasslike leaves; north temperate regions
 
bog aster
a variety of aster
 
bog hemp
any of several flowering weeds of the genus Boehmeria lacking stinging hairs
 
bog moss
any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat
 
bog plant
a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath
 
bole
the main stem of a tree; usually covered with bark; the bole is usually the part that is commercially useful for lumber
 
bolete
any fungus of the family Boletaceae
 
Boletellus russellii
a fungus with a long coarsely shaggy reticulate stalk and a rimose areolate cap surface
 
Boletus chrysenteron
a fungus convex cap and a dingy yellow under surface and a dry stalk
 
Boletus edulis
an edible and choice fungus; has a convex cap that is slightly viscid when fresh and moist but soon dries and a thick bulbous tan stalk
 
Boletus frostii
a fungus with a red cap and a red coarsely reticulate stalk
 
Boletus luridus
a poisonous fungus with a dingy yellow cap and orange red undersurface and a cylindrical reticulate stalk
 
Boletus mirabilis
a fungus that is edible when young and fresh; has a dark brown convex cap with a yellow to greenish under surface and reddish stalk
 
Boletus pallidus
a fungus that has an off-white cap when it is young but later becomes dingy brown and a stalk of the same color; the under surface of the cap (the tubes) a pale greenish yellow
 
Boletus pulcherrimus
a beautiful but poisonous bolete; has a brown cap with a scarlet pore surface and a thick reticulate stalk
 
Boletus pulverulentus
an edible fungus with a broadly convex blackish brown cap and a pore surface that is yellow when young and darkens with age; stalk is thick and enlarges toward the base
 
Boletus roxanae
a fungus with a rusty red cap and a white pore surface that becomes yellow with age and a pale yellow stalk
 
Boletus subvelutipes
a fungus with a velvety stalk and usually a dingy brown cap; injured areas turn blue instantly
 
Boletus variipes
an edible (but not choice) fungus found on soil under hardwoods; has a dry convex cap with whitish under surface and a reticulate stalk
 
Boletus zelleri
an edible and choice fungus that has a brown cap with greenish yellow under surface and a stalk that become dull red with age
 
boll
the rounded seed-bearing capsule of a cotton or flax plant
 
Bomarea edulis
tropical vine having pink-and-yellow flowers spotted purple and edible roots sometimes boiled as a potato substitute; West Indies to northern South America
 
Bomarea salsilla
tropical vine having umbels of small purple flowers and edible roots sometimes boiled as a potato substitute; Colombia
 
Bombax malabarica
East Indian silk cotton tree yielding fibers inferior to kapok
 
bonduc nut
hard shiny grey seed of a bonduc tree; used for making e.g. jewelry
 
bonsai
a dwarfed ornamental tree or shrub grown in a tray or shallow pot
 
Boott's goldenrod
a variety of goldenrod
 
Borago officinalis
hairy blue-flowered European annual herb long used in herbal medicine and eaten raw as salad greens or cooked like spinach
 
Borassus flabellifer
tall fan palm of Africa and India and Malaysia yielding a hard wood and sweet sap that is a source of palm wine and sugar; leaves used for thatching and weaving
 
Boswellia carteri
tree yielding an aromatic gum resin burned as incense
 
Boswellia serrata
East Indian tree yielding a resin used medicinally and burned as incense
 
Botrychium lunaria
of America and Eurasia and Australia
 
Botrychium matricariifolium
of North America and Eurasia
 
Botrychium multifidum
European fern with leathery and sparsely hairy fronds
 
Botrychium virginianum
American fern whose clustered sporangia resemble a snake's rattle
 
bottle tree
an Australian tree of the genus Brachychiton
 
bottlebrush buckeye
a spreading shrub with pink flowers; found in southeastern United States
 
bougainvillea
any of several South American ornamental woody vines of the genus Bougainvillea having brilliant red or purple flower bracts; widely grown in warm regions
 
Bougainvillea glabra
Brazilian vine that tends to flower continuously
 
bough
any of the larger branches of a tree
 
Bouteloua eriopoda
a pasture grass (especially of western coastal regions of North America)
 
Bouteloua gracilis
a pasture grass of western North America
 
Bowiea volubilis
much-branched leafless twining South African herb cultivated as an ornamental for its bright green stems growing from large aboveground bulbs
 
bowstring hemp
strong fiber that resembles hemp; obtained from sansevieria and used for e.g. cordage
 
bowstring hemp
grown as a houseplant for its mottled fleshy sword-shaped leaves or as a source of fiber
 
box
evergreen shrubs or small trees
 
boxthorn
any of various shrubs or vines of the genus Lycium with showy flowers and bright berries
 
Boykinia occidentalis
plant with leaves mostly at the base and openly branched clusters of small white flowers; western North America
 
boysenberry
cultivated hybrid bramble of California having large dark wine-red fruit with a flavor resembling raspberries
 
Brachychiton acerifolius
south Australian tree having panicles of brilliant scarlet flowers
 
Brachychiton australis
north Australian tree having white flowers and broad leaves
 
Brachychiton populneus
widely distributed tree of eastern Australia yielding a tough durable fiber and soft light attractively grained wood; foliage is an important emergency food for cattle
 
Brachychiton rupestris
large tree of Queensland having cream-colored flowers blotched with red inside; sometimes placed in genus Sterculia
 
Brachycome Iberidifolia
western Australian annual much cultivated for its flower heads with white or bluish to violet or variegated rays
 
Brachystegia speciformis
small shrubby African tree having compound leaves and racemes of small fragrant green flowers
 
bracket fungus
a woody fungus that forms shelflike sporophores on tree trunks and wood structures
 
bract
a modified leaf or leaflike part just below and protecting an inflorescence
 
bracteole
a small bract
 
Bradley's spleenwort
a spleenwort of eastern to southern United States
 
brake
any of various ferns of the genus Pteris having pinnately compound leaves and including several popular houseplants
 
bramble
any of various rough thorny shrubs or vines
 
bramble bush
any prickly shrub of the genus Rubus bearing edible aggregate fruits
 
branch
a division of a stem, or secondary stem arising from the main stem of a plant
 
branchlet
a small branch or division of a branch (especially a terminal division); usually applied to branches of the current or preceding year
 
Brasenia schreberi
aquatic plant with floating oval leaves and purple flowers; in lakes and slow-moving streams; suitable for aquariums
 
brassavola
any of various tropical American orchids with usually solitary fleshy leaves and showy white to green nocturnally fragrant blossoms solitary or in racemes of up to 7
 
Brassia lawrenceana
South American orchid with spiderlike pale-yellow to pale-green flowers
 
Brassia verrucosa
Central American orchid having spiderlike flowers with prominent green warts
 
Brassica hirta
Eurasian mustard cultivated for its pungent seeds; a source of table mustard and mustard oil
 
Brassica juncea
Asiatic mustard used as a potherb
 
Brassica napus
Eurasian plant cultivated for its seed and as a forage crop
 
Brassica napus napobrassica
a cruciferous plant with a thick bulbous edible yellow root
 
Brassica nigra
widespread Eurasian annual plant cultivated for its pungent seeds; a principal source of table mustard
 
Brassica oleracea
wild original of cultivated cabbages; common in western coastal Europe
 
Brassica oleracea
any of various cultivars of the genus Brassica oleracea grown for their edible leaves or flowers
 
Brassica oleracea acephala
a hardy cabbage with coarse curly leaves that do not form a head
 
Brassica oleracea botrytis
a plant having a large edible head of crowded white flower buds
 
Brassica oleracea capitata
any of various cultivated cabbage plants having a short thick stalk and large compact head of edible usually green leaves
 
Brassica oleracea gemmifera
plant grown for its stout stalks of edible small green heads resembling diminutive cabbages
 
Brassica oleracea gongylodes
plant cultivated for its enlarged fleshy turnip-shaped edible stem
 
Brassica oleracea italica
plant with dense clusters of tight green flower buds
 
Brassica rapa
widely cultivated plant having a large fleshy edible white or yellow root
 
Brassica rapa chinensis
Asiatic plant grown for its cluster of edible white stalks with dark green leaves
 
Brassica rapa pekinensis
plant with an elongated head of broad stalked leaves resembling celery; used as a vegetable in east Asia
 
Brassica rapa perviridis
Asiatic plant cultivated for its swollen root crown and edible foliage
 
Brassica rapa ruvo
plant grown for its pungent edible leafy shoots
 
Brazilian potato tree
South American shrub or small tree widely cultivated in the tropics; not a true potato
 
Brazilian rosewood
an important Brazilian timber tree yielding a heavy hard dark-colored wood streaked with black
 
brazilwood
heavy wood of various brazilwood trees; used for violin bows and as dyewoods
 
breakstone
any of various plants of the genus Saxifraga
 
Brewer's mountain heather
semi-prostrate evergreen herb of western United States
 
briarroot
hard woody root of the briar Erica arborea
 
briarwood
wood from the hard woody root of the briar Erica arborea; used to make tobacco pipes
 
brier
a thorny stem or twig
 
brier
tangled mass of prickly plants
 
briony
a vine of the genus Bryonia having large leaves and small flowers and yielding acrid juice with emetic and purgative properties
 
bristle fern
any fern of the genus Trichomanes having large pinnatifid often translucent fronds; most are epiphytic on tree branches and twigs or terrestrial on mossy banks
 
bristle grass
grasses of grasslands and woodlands having large gracefully arching spikes with long bristles beneath each spikelet
 
broad bean
seed of the broad-bean plant
 
broad leaved centaury
a variety of centaury with broad leaves
 
broad leaved goldenrod
a variety of goldenrod
 
brodiaea
any of several plants of the genus Brodiaea having basal grasslike leaves and globose flower heads on leafless stems resembling those of genus Allium
 
Brodiaea elegans
brodiaea having an umbel of violet or blue-violet flowers atop a leafless stalk; northern Oregon to southern California
 
brome
any of various woodland and meadow grasses of the genus Bromus; native to temperate regions
 
Bromelia
the type genus of the family Bromeliaceae which includes tropical American plants with deeply cleft calyx
 
Bromus arvensis
annual grass of Europe and temperate Asia
 
Bromus inermis
drought-resistant perennial with awns lacking or very short and long creeping rhizomes; Europe and temperate Asia
 
Bromus japonicus
grass of Mediterranean and temperate Asia
 
Bromus secalinus
weedy annual native to Europe but widely distributed as a weed especially in wheat
 
Bromus tectorum
annual or winter annual grass with softly hairy leaves of the Mediterranean
 
broom
any of various shrubs of the genera Cytisus or Genista or Spartium having long slender branches and racemes of yellow flowers
 
broom grass
any of several grasses of the genus Andropogon; used in broom making
 
Broussonetia papyrifera
shrubby Asiatic tree having bark (tapa) that resembles cloth; grown as a shade tree in Europe and America; male flowers are pendulous catkins and female are urn-shaped followed by small orange-red aggregate berries
 
browallia
any of several herbs of the genus Browallia cultivated for their blue or violet or white flowers
 
brown cup
a variety of sclerotinia
 
Bruckenthalia spiculifolia
small evergreen mat-forming shrub of southern Europe and Asia Minor having stiff stems and terminal clusters of small bell-shaped flowers
 
Brugmansia arborea
a South American plant that is cultivated for its large fragrant trumpet-shaped flowers
 
Brugmansia sanguinea
arborescent South American shrub having very large orange-red flowers
 
Brugmansia suaveolens
South American plant cultivated for its very large nocturnally fragrant trumpet-shaped flowers
 
Brunfelsia americana
West Indian shrub with fragrant showy yellowish-white flowers
 
Brya ebenus
West Indian tree yielding a fine grade of green ebony
 
bryanthus
procumbent Old World mat-forming evergreen shrub with racemes of pinkish-white flowers
 
Bryanthus taxifolius
small shrub with tiny evergreen leaves and pink or purple flowers; Alpine summits and high ground in Asia and Europe and United States
 
Bryonia alba
white-flowered vine having thick roots and bearing small black berries; Europe to Iran
 
Bryonia dioica
bryony having fleshy roots pale green flowers and very small red berries; Europe; North Africa; western Asia
 
bryophyte
any of numerous plants of the division Bryophyta
 
Buchloe dactyloides
short grass growing on dry plains of central United States (where buffalo roam)
 
buckeye
the inedible nutlike seed of the horse chestnut
 
buckler fern
any of various ferns of the genera Dryopteris or Polystichum or Lastreopsis having somewhat shield-shaped coverings on the sori
 
Buckleya distichophylla
parasitic shrub of the eastern United States having opposite leaves and insignificant greenish flowers followed by oily dull green olivelike fruits
 
buckthorn
any shrub or small tree of the genus Bumelia
 
buckthorn
a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments
 
buckthorn berry
fruit of various buckthorns yielding dyes or pigments
 
bud
a swelling on a plant stem consisting of overlapping immature leaves or petals
 
bud
a partially opened flower
 
buddleia
tropical shrub having clusters of white or violet or yellow flowers
 
buffalo nut
oily drupaceous fruit of rabbitwood
 
bugbane
a plant of the genus Cimicifuga having flowers in long racemes or panicles reported to be distasteful to insects
 
bugle
any of various low-growing annual or perennial evergreen herbs native to Eurasia; used for ground cover
 
bulb
a modified bud consisting of a thickened globular underground stem serving as a reproductive structure
 
bulbil
small bulb or bulb-shaped growth arising from the leaf axil or in the place of flowers
 
bulbous iris
any of various irises having a rootstock formed like a bulb
 
bulbous plant
plant growing from a bulb
 
Bulnesia sarmienti
South American tree of dry interior regions of Argentina and Paraguay having resinous heartwood used for incense
 
Bumelia lanuginosa
deciduous tree of southeastern United States and Mexico
 
Bumelia lycioides
shrubby thorny deciduous tree of southeastern United States with white flowers and small black drupaceous fruit
 
bunch grass
any of various grasses of many genera that grow in tufts or clumps rather than forming a sod or mat; chiefly of western United States
 
Buphthalmum salicifolium
hairy Eurasian perennial having deep yellow daisies on lax willowy stems; found in the wild in open woodland and on rocky slopes
 
bur grass
a grass of the genus Cenchrus
 
bur reed
marsh plant having elongated linear leaves and round prickly fruit
 
bur
seed vessel having hooks or prickles
 
burdock
any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs
 
burl
a large rounded outgrowth on the trunk or branch of a tree
 
burl
the wood cut from a tree burl or outgrowth; often used decoratively in veneer
 
burning bush
(Old Testament) the bush that burned without being consumed and from which God spoke to Moses
 
Bursera microphylla
small tree or shrub of the southwestern United States having a spicy odor and odd-pinnate leaves and small clusters of white flowers
 
Bursera simaruba
tropical American tree yielding a reddish resin used in cements and varnishes
 
bush bean
a bean plant whose bushy growth needs no supports
 
bush clover
shrubby or herbaceous plants widely used for forage, soil improvement, and especially hay in southern United States
 
bush pea
any of various plants of the genus Thermopsis having trifoliate leaves and yellow or purple racemose flowers
 
bush poppy
evergreen shrub of southwestern United States and Mexico often cultivated for its fragrant golden yellow flowers
 
bush
a low woody perennial plant usually having several major stems
 
Butea monosperma
East Indian tree bearing a profusion of intense vermilion velvet-textured blooms and yielding a yellow dye
 
butt
the part of a plant from which the roots spring or the part of a stalk or trunk nearest the roots
 
buttercup squash
plant bearing somewhat drum-shaped fruit having dark green rind with greyish markings
 
buttercup
any of various plants of the genus Ranunculus
 
butterfly flower
any plant of the genus Schizanthus having finely divided leaves and showy variegated flowers
 
butterfly orchid
any orchid of the genus Psychopsis: spectacular large tiger-striped orchids
 
butterfly orchid
any orchid of the genus Oncidium: characterized by slender branching sprays of small yellow and brown flowers; often grown as houseplants
 
butterweed
any of several yellow-flowered plants of the genus Packera; often placed in genus Senecio
 
butterwort
any of numerous carnivorous bog plants of the genus Pinguicula having showy purple or yellow or white flowers and a rosette of basal leaves coated with a sticky secretion to trap small insects
 
button
any of various plant parts that resemble buttons
 
Buxus sempervirens
large slow-growing evergreen shrub or small tree with multiple stems; extensively used for hedges or borders and topiary figures
 
Cabernet Sauvignon grape
superior red wine grapes grown especially in the Bordeaux region of France and northern California
 
Cabomba caroliniana
common aquatic plant of eastern North America having floating and submerged leaves and white yellow-spotted flowers
 
Cacalia javanica
tropical African annual having scarlet tassel-shaped flower heads; sometimes placed in genus Cacalia
 
cactus
any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines
 
Caesalpinia bonducella
tropical tree with large prickly pods of seeds that resemble beans and are used for jewelry and rosaries
 
Caesalpinia coriaria
small thornless tree or shrub of tropical America whose seed pods are a source of tannin
 
Caesalpinia decapetala
spreading thorny shrub of tropical Asia bearing large erect racemes of red-marked yellow flowers
 
Caesalpinia echinata
tropical tree with prickly trunk; its heavy red wood yields a red dye and is used for cabinetry
 
Caesalpinia ferrea
thornless tree yielding heavy wood
 
Caesalpinia gilliesii
a tropical flowering shrub having bright orange or red flowers; sometimes placed in genus Poinciana
 
Caesalpinia pulcherrima
tropical shrub or small tree having showy yellow to orange-red flowers; sometimes placed in genus Poinciana
 
Cajanus cajan
tropical woody herb with showy yellow flowers and flat pods; much cultivated in the tropics
 
Cakile maritima
salt-tolerant seashore annual grown for its fragrant rose or violet flowers and fleshy grey-green foliage
 
calabar bean
dark brown highly poisonous seed of the calabar-bean vine; source of physostigmine and used in native witchcraft
 
calabash
round gourd of the calabash tree
 
caladenia
any of various orchids of the genus Caladenia
 
Caladenia cairnsiana
orchid with reddish linear leaves and panicle of purple-marked pale-yellow flowers with deep red or purple lip; southwestern Australia
 
caladium
any plant of the genus Caladium cultivated for their ornamental foliage variously patterned in white or pink or red
 
Caladium bicolor
most popular caladium; cultivated in many varieties since the late 19th century
 
Calamagrostic quadriseta
tall Australian reedlike grass sometimes used for hay
 
Calamagrostis acutiflora
a variety of reed grass
 
calamint
perennial aromatic herbs growing in hedgerows or scrub or open woodlands from western Europe to central Asia and in North America
 
calamus
any tropical Asian palm of the genus Calamus; light tough stems are a source of rattan canes
 
calamus
the aromatic root of the sweet flag used medicinally
 
Calamus australis
tall scrambling spiny palm of northeastern Queensland, Australia
 
calamus oil
carcinogenic oil from calamus root used as a perfume
 
Calamus rotang
climbing palm of Sri Lanka and southern India remarkable for the great length of the stems which are used for malacca canes
 
Calandrinia ciliata
succulent carpet-forming plant having small brilliant reddish-pink flowers; southwestern United States
 
calanthe
any of various showy orchids of the genus Calanthe having white or yellow or rose-colored flowers and broad leaves folded lengthwise
 
calceolaria
any garden plant of the genus Calceolaria having flowers with large inflated slipper-shaped lower lip
 
calendula
any of numerous chiefly annual herbs of the genus Calendula widely cultivated for their yellow or orange flowers; often used for medicinal and culinary purposes
 
Calendula officinalis
the common European annual marigold
 
calico aster
a variety of aster
 
California beauty
any of several handsome evergreen shrubs of California and northern Mexico having downy lobed leaves and showy yellow flowers
 
California black oak
large deciduous tree of the Pacific coast having deeply parted bristle-tipped leaves
 
California black walnut
medium-sized tree with somewhat aromatic compound leaves and edible nuts
 
California bluebell
desert plant of southern California with blue or violet tubular flowers in terminal racemes
 
California buckthorn
evergreen shrub of western United States bearing small red or black fruits
 
California false morel
a gyromitra with a brown puffed up fertile part and a thick fluted stalk; found under conifers in California
 
California four o'clock
California four o'clock with purple-red flowers
 
California lady's slipper
often having many yellow-green orchids with white pouches growing along streams and seeps of southwestern Oregon and northern California
 
California live oak
highly variable often shrubby evergreen oak of coastal zone of western North America having small thick usually spiny-toothed dark-green leaves
 
California single-leaf pinyon
very small tree similar to Rocky mountain pinon but having a single needle per fascicle; similar to Parry's pinyon in range
 
California sycamore
tall tree of Baja California having deciduous bark and large alternate palmately lobed leaves and ball-shaped clusters of flowers
 
California tree poppy
tall branching subshrub of California and Mexico often cultivated for its silvery-blue foliage and large fragrant white flowers
 
California white fir
medium to tall fir of central to western United States having a narrow erect crown and soft wood
 
California white oak
tall graceful deciduous California oak having leathery leaves and slender pointed acorns
 
California yellow bells
viscid herb of arid or desert habitats of southwestern United States having pendulous yellow flowers
 
Calla palustris
plant of wetlands and bogs of temperate regions having small greenish flowers partly enclosed in a white spathe and red berries
 
calliandra
any of various shrubs and small trees valued for their fine foliage and attractive spreading habit and clustered white to deep pink or red flowers
 
Callirhoe digitata
perennial poppy mallow of United States southern plains states having rose-red or rose-purple flowers
 
Callirhoe involucrata
hairy perennial of central United States having round deeply lobed leaves and loose panicles of large crimson-purple or cherry-red flowers
 
Callirhoe triangulata
densely hairy perennial having mostly triangular basal leaves and rose-purple flowers in panicled clusters
 
Callistephus chinensis
valued for their beautiful flowers in a wide range of clear bright colors; grown primarily for cutting
 
Callitris cupressiformis
Australian cypress pine having globular cones
 
Callitris endlicheri
Australian tree with small flattened scales as leaves and numerous dark brown seed; valued for its timber and resin
 
Callitris glaucophylla
small tree or shrub of southern Australia
 
Callitris parlatorei
Australian cypress pine with fibrous inner bark
 
Calluna vulgaris
common Old World heath represented by many varieties; low evergreen grown widely in the northern hemisphere
 
callus
(botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid
 
Calocarpum zapota
tropical American tree having wood like mahogany and sweet edible egg-shaped fruit; in some classifications placed in the genus Calocarpum
 
Calochortus albus
globe lily having open branched clusters of egg-shaped white flowers; southern California
 
Calochortus amabilis
globe lily having open branched clusters of clear yellow egg-shaped flowers; northern California
 
Calochortus amoenus
globe lily with deep rose-pink or purple egg-shaped flowers on flexuous stems; western slopes of Sierra Nevada in San Joaquin Valley
 
Calochortus elegans
small plant with slender bent stems bearing branched clusters of a few white star-shaped flowers with petals shaped like cat's ears; southeastern Washington and northeastern Oregon to Montana
 
Calochortus kennedyi
mariposa with clusters of bell-shaped vermilion or orange or yellow flowers atop short stems; southern California to Arizona and Mexico
 
Calochortus luteus
mariposa having clusters of a few large deep yellow bell-shaped flowers atop slender stems; California coastal ranges
 
Calochortus macrocarpus
mariposa having loose clusters of one to three handsome lilac flowers resembling umbels atop stout erect stems; arid northwestern North America east of Cascade Mountains from southern British Columbia to northern California
 
Calochortus nuttallii
perennial plant having clusters of one to four showy white bell-shaped flowers atop erect unbranched stems; edible bulbs useful in times of scarcity; eastern Montana and western North Dakota south to northern Arizona and northwestern New Mexico
 
Calophyllum calaba
West Indian tree having racemes of fragrant white flowers and yielding a durable timber and resinous juice
 
Calophyllum candidissimum
tropical American tree; valued for its hard durable wood
 
Calophyllum inophyllum
East Indian tree having racemes of fragrant white flowers; coastal areas southern India to Malaysia
 
Calophyllum longifolium
valuable timber tree of Panama
 
Calopogon pulchellum
an orchid
 
Caloscypha fulgens
an early spring variety of discomycete with yellow to orange yellow lining of the cup
 
Calostoma cinnabarina
a gasteromycete with a leathery stalk and a fruiting body this globose and has a red spore case
 
Calostoma lutescens
a gasteromycete with a leathery stalk and a fruiting body that is globose and has a pale yellow spore case
 
Calostoma ravenelii
a gasteromycete with a leathery stalk and a fruiting body with a thin gelatinous spore case and elliptical spores
 
Caltha palustris
swamp plant of Europe and North America having bright yellow flowers resembling buttercups
 
caltrop
a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits
 
Calvatia gigantea
huge edible puffball up to 2 feet diameter and 25 pounds in weight
 
Calycanthus floridus
hardy shrub of southeastern United States having clove-scented wood and fragrant red-brown flowers
 
Calycanthus occidentalis
straggling aromatic shrub of southwestern United States having fragrant brown flowers
 
calycle
a group of bracts simulating a calyx as in a carnation or hibiscus
 
Calycophyllum candidissimum
source of a tough elastic wood
 
Calypso bulbosa
rare north temperate bog orchid bearing a solitary white to pink flower marked with purple at the tip of an erect reddish stalk above 1 basal leaf
 
calyptra
the hood or cap covering the calyx of certain plants: e.g., the California poppy
 
Calyptridium umbellatum
pink clusters of densely packed flowers on prostrate stems resemble upturned pads of cats' feet; grow in coniferous forests of western North America
 
calyx
(botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green
 
calyx tube
the cuplike or ringlike or tubular structure of a flower which bears the sepals and stamens and calyx (as in Rosaceae)
 
camas
any of several plants of the genus Camassia; North and South America
 
Camassia leichtlinii
camas found to the west of Cascade Mountains
 
Camassia quamash
plant having a large edible bulb and linear basal leaves and racemes of light to deep violet-blue star-shaped flowers on tall green scapes; western North America
 
Camassia scilloides
eastern camas; eastern and central North America
 
cambium
a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth
 
camelia
any of several shrubs or small evergreen trees having solitary white or pink or reddish flowers
 
Camelina sativa
annual European false flax having small white flowers; cultivated since Neolithic times as a source of fiber and for its oil-rich seeds; widely naturalized in North America
 
Camellia japonica
greenhouse shrub with glossy green leaves and showy fragrant rose-like flowers; cultivated in many varieties
 
Camellia sinensis
a tropical evergreen shrub or small tree extensively cultivated in e.g. China and Japan and India; source of tea leaves
 
Campanula americana
annual or perennial of eastern North America with long spikes of blue or white flowers
 
Campanula aparinoides
bellflower common in marshes of eastern North America having lanceolate linear leaves and small whitish flowers
 
Campanula carpatica
European perennial bellflower that grows in clumps with spreading stems and blue or white flowers
 
Campanula divaricata
bellflower of southeastern United States (Maryland to Georgia) having pale blue flowers
 
Campanula glomerata
bellflower of Europe to temperate Asia having dense spikes of violet-blue to white flowers
 
Campanula medium
European biennial widely cultivated for its blue or violet or white flowers
 
Campanula persicifolia
perennial European bellflower with racemose white or blue flowers
 
Campanula pyramidalis
bellflower of southeastern Europe
 
Campanula rapunculoides
erect European herb with creeping rootstocks and nodding spikelike racemes of blue to violet flowers
 
Campanula rapunculus
bellflower of Europe and Asia and North Africa having bluish flowers and an edible tuberous root used with the leaves in salad
 
Campanula rotundifolia
perennial of northern hemisphere with slender stems and bell-shaped blue flowers
 
Campanula trachelium
European bellflower with blue-purple to lilac flowers formerly used to treat sore throat
 
campion
any plant of the genus Silene
 
Campsis radicans
a North American woody vine having pinnate leaves and large red trumpet-shaped flowers
 
Camptosorus rhizophyllus
ferns having lanceolate fronds that root at the tip
 
campylotropous ovule
a curved ovule with the micropyle almost touching the funiculus
 
Canadian red pine
pine of eastern North America having long needles in bunches of two and reddish bark
 
Cananga odorata
evergreen Asian tree with aromatic greenish-yellow flowers yielding a volatile oil; widely grown in the tropics as an ornamental
 
Canary Island hare's foot fern
fern of the Canary Islands and Madeira
 
Canavalia ensiformis
annual semi-erect bushy plant of tropical South America bearing long pods with white seeds grown especially for forage
 
Canavalia gladiata
twining tropical Old World plant bearing long pods usually with red or brown beans; long cultivated in Orient for food
 
candida
any of the yeastlike imperfect fungi of the genus Candida
 
candlenut
seed of candlenut tree; source of soil used in varnishes
 
candlewood
any of several resinous trees or shrubs often burned for light
 
candytuft
any of various flowering plants of the genus Iberis cultivated for their showy clusters of white to red or purple flowers; native to Mediterranean region
 
cane
a strong slender often flexible stem as of bamboos, reeds, rattans, or sugar cane
 
Canella winterana
large evergreen shrub or small tree having white aromatic bark and leathery leaves and small purple to red flowers in terminal cymes
 
canella
highly aromatic inner bark of the Canella winterana used as a condiment and a tonic
 
canna
any plant of the genus Canna having large sheathing leaves and clusters of large showy flowers
 
Canna generalis
plants grown for their large bright yellow to red flowers
 
Canna indica
canna grown especially for its edible rootstock from which arrowroot starch is obtained
 
Cannabis indica
source of e.g. bhang and hashish as well as fiber
 
Cannabis sativa
a strong-smelling plant whose dried leaves can be smoked for a pleasant effect or pain reduction
 
cannabis
any plant of the genus Cannabis; a coarse bushy annual with palmate leaves and clusters of small green flowers; yields tough fibers and narcotic drugs
 
Cantharellus cibarius
widely distributed edible mushroom rich yellow in color with a smooth cap and a pleasant apricot aroma
 
Cantharellus cinnabarinus
mushroom with a distinctive pink to vermillion fruiting body
 
Cantharellus clavatus
an edible agaric with a brown fruiting body that is often compound
 
Cantharellus floccosus
a mildly poisonous fungus with a fruiting body shaped like a hollow trumpet
 
cap
a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom
 
cape marigold
any of several South African plants grown for the profusion of usually yellow daisylike flowers and mounds of aromatic foliage
 
Cape primrose
any of various African plants of the genus Streptocarpus widely cultivated especially as houseplants for their showy blue or purple flowers
 
caper
any of numerous plants of the genus Capparis
 
capitulum
an arrangement of leafy branches forming the top or head of a tree
 
capitulum
fruiting spike of a cereal plant especially corn
 
capitulum
a dense cluster of flowers or foliage
 
Capparis arborea
small Australian tree bearing edible fruit resembling the pomegranate
 
Capparis cynophallophora
shrub of southern Florida to West Indies
 
Capparis flexuosa
shrub or small tree of southern Florida to Central and South America
 
Capparis mitchellii
small Australian tree bearing edible dark purple fruit
 
Capparis spinosa
prostrate spiny shrub of the Mediterranean region cultivated for its greenish flower buds which are pickled
 
Capsella bursa-pastoris
white-flowered annual European herb bearing triangular notched pods; nearly cosmopolitan as an introduced weed
 
Capsicum annuum cerasiforme
plant bearing small rounded usually pungent fruits
 
Capsicum annuum conoides
plant bearing erect pungent conical red or yellow or purple fruits; sometimes grown as an ornamental
 
Capsicum annuum grossum
plant bearing large mild thick-walled usually bell-shaped fruits; the principal salad peppers
 
Capsicum annuum longum
plant bearing very hot and finely tapering long peppers; usually red
 
Capsicum frutescens
plant bearing very hot medium-sized oblong red peppers; grown principally in the Gulf Coast states for production of hot sauce
 
Capsicum frutescens baccatum
plant bearing very small and very hot oblong red fruits; includes wild forms native to tropical America; thought to be ancestral to the sweet pepper and many hot peppers
 
capsicum
any of various tropical plants of the genus Capsicum bearing peppers
 
capsule
a dry dehiscent seed vessel or the spore-containing structure of e.g. mosses
 
Caragana arborescens
large spiny shrub of eastern Asia having clusters of yellow flowers; often cultivated in shelterbelts and hedges
 
caragana
any plant of the genus Caragana having even-pinnate leaves and mostly yellow flowers followed by seeds in a linear pod
 
Cardamine bulbifera
European bittercress having a knotted white rootstock
 
Cardamine bulbosa
small white-flowered cress common in wet places in eastern North America
 
Cardamine diphylla
North American herb with pungent scaly or toothed roots
 
Cardamine douglasii
small perennial herb of cooler regions of North America with racemose purple flowers
 
Cardamine pratensis
a bitter cress of Europe and America
 
Cardamine rotundifolia
mat-forming perennial found in cold springs of the eastern United States
 
Cardiospermum grandiflorum
herbaceous vine of tropical America and Africa
 
Cardiospermum halicacabum
woody perennial climbing plant with large ornamental seed pods that resemble balloons; tropical India and Africa and America
 
Carduus crispus
European biennial introduced in North America having flower heads in crowded clusters at ends of branches
 
Carduus nutans
Eurasian perennial naturalized in eastern North America having very spiny white cottony foliage and nodding musky crimson flower heads; valuable source of nectar
 
Carex arenaria
European maritime sedge naturalized along Atlantic coast of United States; rootstock has properties of sarsaparilla
 
Carex pseudocyperus
tufted sedge of temperate regions; nearly cosmopolitan
 
Carica papaya
tropical American shrub or small tree having huge deeply palmately cleft leaves and large oblong yellow fruit
 
carissa
a shrub of the genus Carissa having fragrant white flowers and plumlike red to purple-black fruits
 
Carissa bispinosa
South African shrub having forked spines and plumlike fruit; frequently used as hedging
 
Carissa grandiflora
very large closely branched South African shrub having forked bright green spines and shiny leaves
 
Carlina acaulis
stemless perennial having large flowers with white or purple-brown florets nestled in a rosette of long spiny leaves hairy beneath; of alpine regions of southern and eastern Europe
 
Carlina vulgaris
Eurasian thistle growing in sand dunes and dry chalky soils
 
carline thistle
a thistle of the genus Carlina
 
carnauba
hard yellowish to brownish wax from leaves of the carnauba palm used especially in floor waxes and polishes
 
Carnegiea gigantea
extremely large treelike cactus of desert regions of southwestern United States having a thick columnar sparsely branched trunk bearing white flowers and edible red pulpy fruit
 
carnivorous plant
plants adapted to attract and capture and digest primarily insects but also other small animals
 
Carolina pond fern
small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe
 
Carolina spring beauty
similar to Claytonia virginica but having usually pink flowers; eastern North America
 
carpel
a simple pistil or one element of a compound pistil
 
Carpenteria californica
California evergreen shrub having glossy opposite leaves and terminal clusters of a few fragrant white flowers
 
Carpinus caroliniana
tree or large shrub with grey bark and blue-green leaves that turn red-orange in autumn
 
carpophore
a slender stalk that furnishes an axis for a carpel
 
carpospore
a nonmotile spore of red algae
 
carrion flower
any of various plants of the genus Stapelia having succulent leafless toothed stems resembling cacti and large foul-smelling (often star-shaped) flowers
 
carrion fungus
any of various ill-smelling brown-capped fungi of the order Phallales
 
carrot
deep orange edible root of the cultivated carrot plant
 
Carthamus tinctorius
thistlelike Eurasian plant widely grown for its red or orange flower heads and seeds that yield a valuable oil
 
Carum carvi
a Eurasian plant with small white flowers yielding caraway seed
 
Carya aquatica
hickory of southern United States having many narrow leaflets and rather bitter nuts
 
Carya cordiformis
hickory of the eastern United States having a leaves with 7 or 9 leaflets and thin-shelled very bitter nuts
 
Carya glabra
an American hickory tree having bitter nuts
 
Carya illinoinsis
tree of southern United States and Mexico cultivated for its nuts
 
Carya laciniosa
hickory of the eastern United States resembling the shagbark but having a much larger nut
 
Carya myristicaeformis
hickory of southern United States and Mexico having hard nutmeg-shaped nuts
 
Carya ovata
North American hickory having loose grey shaggy bark and edible nuts
 
Carya tomentosa
smooth-barked North American hickory with 7 to 9 leaflets bearing a hard-shelled edible nut
 
Caryocar nuciferum
large South American evergreen tree trifoliate leaves and drupes with nutlike seeds used as food and a source of cooking oil
 
caryophyllaceous plant
a plant of the family Caryophyllaceae
 
caryophylloid dicot family
family of relatively early dicotyledonous plants including mostly flowers
 
caryophylloid dicot genus
genus of relatively early dicotyledonous plants including mostly flowers
 
caryopsis
dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn
 
Caryota urens
fishtail palm of India to Malay Peninsula; sap yields a brown sugar (jaggery) and trunk pith yields sago
 
casava
any of several plants of the genus Manihot having fleshy roots yielding a nutritious starch
 
cascara
dried bark of the cascara buckthorn used as a laxative
 
cascarilla bark
aromatic bark of cascarilla; used as a tonic and for making incense
 
cash crop
a readily salable crop that is grown and gathered for the market (as vegetables or cotton or tobacco)
 
cassava
cassava root eaten as a staple food after drying and leaching; source of tapioca
 
cassia
any of various trees or shrubs of the genus Cassia having pinnately compound leaves and usually yellow flowers followed by long seedpods
 
Cassia alata
tropical shrub (especially of Americas) having yellow flowers and large leaves whose juice is used as a cure for ringworm and poisonous bites; sometimes placed in genus Cassia
 
Cassia augustifolia
erect shrub having racemes of tawny yellow flowers; the dried leaves are used medicinally as a cathartic; sometimes placed in genus Cassia
 
Cassia auriculata
evergreen Indian shrub with vivid yellow flowers whose bark is used in tanning; sometimes placed in genus Cassia
 
Cassia fistula
deciduous or semi-evergreen tree having scented sepia to yellow flowers in drooping racemes and pods whose pulp is used medicinally; tropical Asia and Central and South America and Australia
 
Cassia grandis
tropical American semi-evergreen tree having erect racemes of pink or rose-colored flowers; used as an ornamental
 
Cassia javonica
deciduous ornamental hybrid of southeastern Asia and Hawaii having racemes of flowers ranging in color from cream-colored to orange and red
 
Cassia marilandica
North American perennial herb; leaves are used medicinally; sometimes placed in genus Cassia
 
Cassia occidentalis
very leafy malodorous tropical weedy shrub whose seeds have been used as an adulterant for coffee; sometimes classified in genus Cassia
 
Cassia roxburghii
East Indian tree having long pods containing a black cathartic pulp used as a horse medicine
 
Cassiope mertensiana
heath of mountains of western United States having bell-shaped white flowers
 
Castanea mollissima
a small tree with small sweet nuts; wild or naturalized in Korea and China
 
Castanea ozarkensis
shrubby tree closely related to the Allegheny chinkapin but with larger leaves; southern midwestern United States
 
Castanopsis chrysophylla
small ornamental evergreen tree of Pacific Coast whose glossy yellow-green leaves are yellow beneath; bears edible nuts
 
Castilleja chromosa
most common paintbrush of western United States dry lands; having erect stems ending in dense spikes of bright orange to red flowers
 
Castilleja miniata
wildflower of western North America having ragged clusters of crimson or scarlet flowers
 
Castilleja sessiliflora
hairy plant with pinkish flowers; Great Plains to northern Mexico
 
Castilleja sulphurea
plant of moist highland meadows having ragged clusters of pale yellow flowers
 
castor bean
the toxic seed of the castor-oil plant; source of castor oil
 
casuarina
any of various trees and shrubs of the genus Casuarina having jointed stems and whorls of scalelike leaves; some yield heavy hardwood
 
Casuarina equisetfolia
common Australian tree widely grown as an ornamental in tropical regions; yields heavy hard red wood
 
cat's-ear
any of several plants of the genus Calochortus having flowers with petals shaped like cat's ears
 
Catalina cherry
evergreen shrub or small tree found on Catalina Island (California)
 
Catalpa bignioides
catalpa tree of southern United States
 
Catalpa speciosa
catalpa tree of central United States
 
catananche
any of several plants of the genus Catananche having long-stalked heads of blue or yellow flowers
 
Catananche caerulea
south European plant having dark-eyed flowers with flat blue rays
 
cataphyll
a reduced or scarcely developed leaf at the start of a plant's life (i.e., cotyledons) or in the early stages of leaf development
 
Catasetum macrocarpum
orchid having both male and female flowers in the same raceme; when a sensitive projection at the base of the column of the male flower is touched the pollen is suddenly ejected
 
catch crop
a crop that grows quickly (e.g. lettuce) and can be planted between two regular crops grown in successive seasons or between two rows of crops in the same season
 
catchfly
mostly perennial herbs with sticky stems that catch insects; widespread in north temperate zone
 
Catha edulis
a shrub that is cultivated by Arabs for its leaves which are chewed or used to make tea
 
Cathaya
Chinese evergreen conifer discovered in 1955; not yet cultivated elsewhere
 
cattail
tall erect herbs with sword-shaped leaves; cosmopolitan in fresh and salt marshes
 
cattleya
any orchid of the genus Cattleya characterized by a three-lobed lip enclosing the column; among the most popular and most extravagantly beautiful orchids known
 
caudex
woody stem of palms and tree ferns
 
caudex
persistent thickened stem of a herbaceous perennial plant
 
Caulophyllum thalictrioides
tall herb of eastern North America and Asia having blue berrylike fruit and a thick knotty rootstock formerly used medicinally
 
Cebu maguey
hard fiber used in making coarse twine; from Philippine agave plants
 
Cecropia peltata
tropical American tree with large peltate leaves and hollow stems
 
cedar nut
the seed of the Swiss pine
 
cedar of Lebanon
cedar of Lebanon and northwestern Syria that attains great age and height
 
cedar
any of numerous trees of the family Cupressaceae that resemble cedars
 
cedar
any cedar of the genus Cedrus
 
cedar
durable aromatic wood of any of numerous cedar trees; especially wood of the red cedar often used for cedar chests
 
Cedrus atlantica
tall Algerian evergreen of Atlas mountains with blue-green leaves; widely planted as an ornamental
 
Ceiba pentandra
massive tropical tree with deep ridges on its massive trunk and bearing large pods of seeds covered with silky floss; source of the silky kapok fiber
 
Celastrus orbiculatus
ornamental Asiatic vine with showy orange-yellow fruit with a scarlet aril; naturalized in North America
 
celery pine
Australasian evergreen conifer having a graceful head of foliage resembling celery that is composed of phyllodes borne in the axils of scalelike leaves
 
cell wall
a rigid layer of polysaccharides enclosing the membrane of plant and prokaryotic cells; maintains the shape of the cell and serves as a protective barrier
 
cellular slime mold
differing from true slime molds in being cellular and nucleate throughout the life cycle
 
Celosia argentea
weedy annual with spikes of silver-white flowers
 
Celosia argentea cristata
garden annual with featherlike spikes of red or yellow flowers
 
Celtis laevigata
deciduous shade tree with small black berries; southern United States; yields soft yellowish wood
 
Celtis occidentalis
large deciduous shade tree of southern United States with small deep purple berries
 
Cenchrus tribuloides
grass of the eastern United States and tropical America having spikelets enclosed in prickly burs
 
Centaurea americana
annual of southwestern United States cultivated for its purple flower heads and its bracts that resemble small baskets
 
Centaurea cyanus
an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers
 
Centaurea gymnocarpa
a plant having leaves and stems covered with down that resembles dust
 
Centaurea imperialis
perennial of mountains of Iran and Iraq; cultivated for its fragrant rose-pink flowers
 
Centaurea moschata
Asian plant widely grown for its sweetly fragrant pink flowers; sometimes placed in genus Centaurea
 
Centaurea nigra
a weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized
 
Centaurea scabiosa
tall European perennial having purple flower heads
 
Centaurea solstitialis
European weed having a winged stem and hairy leaves; adventive in the eastern United States
 
Centauria calcitrapa
Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America
 
Centaurium calycosum
erect plant with small clusters of pink trumpet-shaped flowers of southwestern United States
 
Centaurium minus
common European glabrous annual centaury with flowers in dense cymes
 
Centaurium scilloides
tufted perennial of western Europe and Azores having bright pink to white flowers
 
centaury
any of various plants of the genus Centaurium
 
centaury
any plant of the genus Centaurea
 
Central American strap fern
fern with shorter and narrower leaves than Florida strap fern; Florida to West Indies and Mexico and south to Argentina
 
Centrolobium robustum
Brazilian tree with handsomely marked wood
 
Centrosema virginianum
large-flowered weakly twining or prostrate vine of New Jersey to tropical eastern North America, sometimes cultivated for its purple and white flowers
 
Cephalanthera rubra
orchid of Mediterranean and Asia having a lax spike of bright rose-pink flowers
 
Cerastium alpinum
widespread in the Arctic and on mountains in Europe
 
Cerastium arvense
densely tufted perennial chickweed of north temperate zone
 
Cerastium tomentosum
chickweed with hairy silver-grey leaves and rather large white flowers
 
Ceratonia siliqua
evergreen Mediterranean tree with edible pods; the biblical carob
 
Ceratopetalum gummiferum
Australian tree or shrub with red flowers; often used in Christmas decoration
 
Ceratopteris pteridioides
aquatic fern of tropical America often used in aquariums
 
Ceratopteris thalictroides
pantropical aquatic fern
 
Ceratostomella ulmi
fungus causing Dutch elm disease
 
ceratozamia
a small cycad of the genus Ceratozamia having a short scaly woody trunk and fernlike foliage and woody cones; Mexico
 
Cercidiphyllum japonicum
rapidly growing deciduous tree of low mountainsides of China and Japan; grown as an ornamental for its dark blue-green candy-scented foliage that becomes yellow to scarlet in autumn
 
Cercis canadensis
small shrubby tree of eastern North America similar to the Judas tree having usually pink flowers; found in damp sheltered underwood
 
Cercis occidentalis
shrub of western United States having pink or crimson flowers; often forms thickets
 
Cercospora kopkei
fungus causing yellow spot (a sugarcane disease in Australia)
 
cereal
grass whose starchy grains are used as food: wheat; rice; rye; oats; maize; buckwheat; millet
 
Ceroxylon andicola
palm of the Andes yielding a resinous wax which is mixed with tallow to make candles
 
Cestrum diurnum
West Indian evergreen shrub having clusters of funnel-shaped white flowers that are fragrant by day
 
Cestrum nocturnum
West Indian evergreen shrub having clusters of funnel-shaped yellow-white flowers that are fragrant by night
 
Ceterach officinarum
small European fern with chaffy leathery fronds
 
Cetraria islandica
lichen with branched flattened partly erect thallus that grows in mountainous and Arctic regions; used as a medicine or food for humans and livestock; a source of glycerol
 
chaenactis
any of several United States plants having long stalks of funnel-shaped white or yellow flowers
 
Chaenomeles japonica
deciduous thorny shrub native to Japan having red blossoms
 
Chaenomeles speciosa
deciduous thorny shrub native to China having red or white blossoms
 
chain fern
a fern of the genus Woodwardia having the sori in chainlike rows
 
chalaza
basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined
 
Chamaecrista fasciculata
tropical American plant having leaflets somewhat sensitive to the touch; sometimes placed in genus Cassia
 
Chamaecyparis lawsoniana
large timber tree of western North America with trunk diameter to 12 feet and height to 200 feet
 
Chamaecyparis nootkatensis
tall evergreen of the Pacific coast of North America often cultivated for ornament
 
Chamaecyparis thyoides
slow-growing medium-sized cedar of east coast of the United States; resembles American arborvitae
 
Chamaecytisus palmensis
shrub of Canary Islands having bristle-tipped oblanceolate leaves; used as cattle fodder
 
Chamaedaphne calyculata
north temperate bog shrub with evergreen leathery leaves and small white cylindrical flowers
 
Chamaemelum nobilis
Eurasian plant with apple-scented foliage and white-rayed flowers and feathery leaves used medicinally; in some classification systems placed in genus Anthemis
 
Chardonnay
white wine grape
 
charred pancake cup
a common name for a variety of Sarcosomataceae
 
checkered lily
any liliaceous plant of the genus Fritillaria having nodding variously colored flowers
 
Cheilanthes alabamensis
southeastern United States to northern Mexico and Jamaica
 
Cheilanthes eatonii
lip fern of Texas to Oklahoma and Colorado and Arizona and Mexico having tall erect tufted fronds
 
Cheilanthes gracillima
small tufted fern of northwestern America
 
Cheilanthes lanosa
small North American evergreen fern whose stipes and lower frond surfaces are densely wooly
 
Cheiranthus allionii
showy erect biennial or short-lived perennial cultivated for its terminal racemes of orange-yellow flowers; sometimes placed in genus Cheiranthus
 
Cheiranthus cheiri
perennial of southern Europe having clusters of fragrant flowers of all colors especially yellow and orange; often naturalized on old walls or cliffs; sometimes placed in genus Erysimum
 
Chelidonium majus
perennial herb with branched woody stock and bright yellow flowers
 
Chelone glabra
showy perennial of marshlands of eastern and central North America having waxy lanceolate leaves and flower with lower part creamy white and upper parts pale pink to deep purple
 
Chenin blanc
white grape grown especially in California and the lower Loire valley of France
 
Chenopodium album
common weedy European plant introduced into North America; often used as a potherb
 
Chenopodium ambrosioides
rank-smelling tropical American pigweed
 
Chenopodium bonus-henricus
European plant naturalized in North America; often collected from the wild as a potherb
 
Chenopodium botrys
Eurasian aromatic oak-leaved goosefoot with many yellow-green flowers; naturalized North America
 
Chenopodium capitatum
European annual with clusters of greenish flowers followed by red pulpy berrylike fruit; naturalized North America
 
Chenopodium glaucum
annual European plant with spikes of greenish flowers and leaves that are white and hairy on the underside; common as a weed in North America
 
Chenopodium hybridum
herb considered fatal to swine
 
Chenopodium murale
European annual with coarsely dentate leaves; widespread in United States and southern Canada
 
Chenopodium rubrum
common Eurasian weed; naturalized in United States
 
Chenopodium vulvaria
European goosefoot with strong-scented foliage; adventive in eastern North America
 
cherry
wood of any of various cherry trees especially the black cherry
 
cherry stone
the stone seed of a cherry
 
cherry
any of numerous trees and shrubs producing a small fleshy round fruit with a single hard stone; many also produce a valuable hardwood
 
chestnut
wood of any of various chestnut trees of the genus Castanea
 
chestnut oak
an oak having leaves resembling those of chestnut trees
 
chestnut
any of several attractive deciduous trees yellow-brown in autumn; yield a hard wood and edible nuts in a prickly bur
 
chickpea
the seed of the chickpea plant
 
chickweed
any of various plants of the genus Stellaria
 
chickweed
any of various plants related to the common chickweed
 
chicory
the dried root of the chicory plant: used as a coffee substitute
 
Chile tarweed
South American herb with sticky glandular foliage; source of madia oil
 
Chilopsis linearis
evergreen shrubby tree resembling a willow of dry regions of southwestern North America having showy purplish flowers and long seed pods
 
Chimaphila umbellata
Eurasian herb with white or pinkish flowers in a terminal corymb
 
Chimonanthus praecox
deciduous Japanese shrub cultivated for its fragrant yellow flowers
 
chinchona
any of several trees of the genus Cinchona
 
Chinese angelica tree
similar to American angelica tree but less prickly; China
 
Chinese cinnamon
aromatic bark of the cassia-bark tree; less desirable as a spice than Ceylon cinnamon bark
 
Chinese forget-me-not
biennial east Asian herb grown for its usually bright blue flowers
 
Chinese holly
dense rounded evergreen shrub of China having spiny leaves; widely cultivated as an ornamental
 
Chinese lantern plant
Old World perennial cultivated for its ornamental inflated papery orange-red calyx
 
Chinese pea tree
shrub with dark-green glossy foliage and solitary pale yellow flowers; northern China
 
Chinese rhubarb
long used for laxative properties
 
Chinese scholar tree
handsome roundheaded deciduous tree having compound dark green leaves and profuse panicles of fragrant creamy-white flowers; China and Japan
 
Chinese silk plant
tall perennial herb of tropical Asia with dark green leaves; cultivated for the fiber from its woody stems that resembles flax
 
Chinese water chestnut
Chinese sedge yielding edible bulb-shaped tubers
 
Chionanthus virginicus
small bushy tree of southeastern United States having profuse clusters of white flowers
 
Chionochloa conspicua
used by Maoris for thatching
 
chlamydospore
thick-walled asexual resting spore of certain fungi and algae
 
chlamys
collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils
 
chlorenchyma
parenchyma whose cells contain chloroplasts
 
Chloris gayana
perennial grass of South Africa introduced into United States; cultivated as forage grass in dry regions
 
Chloris truncata
perennial Australian grass having numerous long spikes arranged like the vanes of a windmill
 
Chlorophyllum molybdites
a poisonous agaric with a fibrillose cap and brown scales on a white ground color; cap can reach a diameter of 30 cm; often forms `fairy rings'
 
chloroplast
plastid containing chlorophyll and other pigments; in plants that carry out photosynthesis
 
Chloroxylon swietenia
East Indian tree with valuable hard lustrous yellowish wood
 
chokecherry
the fruit of the chokecherry tree
 
christella
any of several tropical ferns of the genus Christella having thin brittle fronds
 
Christmas bells
any of several plants of the genus Blandfordia having large orange or crimson flowers
 
Christmas green
any of several club mosses having long creeping stems and erect branches
 
Christmas holly
an evergreen tree
 
chromoplast
plastid containing pigments other than chlorophyll usually yellow or orange carotenoids
 
chrysanthemum
any of numerous perennial Old World herbs having showy brightly colored flower heads of the genera Chrysanthemum, Argyranthemum, Dendranthema, Tanacetum; widely cultivated
 
chrysanthemum
the flower of a chrysanthemum plant
 
Chrysanthemum balsamita
tansy-scented Eurasian perennial herb with buttonlike yellow flowers; used as potherb or salad green and sometimes for potpourri or tea or flavoring; sometimes placed in genus Chrysanthemum
 
Chrysanthemum cinerariifolium
white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
 
Chrysanthemum coccineum
spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemum
 
Chrysanthemum coronarium
shrubby annual of the Mediterranean region with yellowish-white flowers
 
Chrysanthemum coronarium spatiosum
grown for its succulent edible leaves used in Asian cooking
 
Chrysanthemum frutescens
perennial subshrub of the Canary Islands having usually pale yellow daisylike flowers; often included in genus Chrysanthemum
 
Chrysanthemum lacustre
perennial of Portugal similar to the oxeye daisy
 
Chrysanthemum leucanthemum
tall leafy-stemmed Eurasian perennial with white flowers; widely naturalized; often placed in genus Chrysanthemum
 
Chrysanthemum maximum
similar to oxeye daisy
 
Chrysanthemum maximum maximum
hybrid garden flower derived from Chrysanthemum maximum and Chrysanthemum lacustre having large white flower heads resembling oxeye daisies; often placed in the genus Chrysanthemum
 
Chrysanthemum parthenium
bushy aromatic European perennial herb having clusters of buttonlike white-rayed flower heads; valued traditionally for medicinal uses; sometimes placed in genus Chrysanthemum
 
Chrysanthemum ptarmiciflorum
shrubby perennial of the Canary Islands having white flowers and leaves and hairy stems covered with dustlike down; sometimes placed in genus Chrysanthemum
 
Chrysanthemum segetum
European herb with bright yellow flowers; a common weed in grain fields
 
Chrysobalanus icaco
small tropical American tree bearing edible plumlike fruit
 
Chrysolepis sempervirens
evergreen shrub similar to golden chinkapin; mountains of California
 
Chrysophyllum cainito
evergreen tree of West Indies and Central America having edible purple fruit star-shaped in cross section and dark green leaves with golden silky undersides
 
Chrysophyllum oliviforme
tropical American timber tree with dark hard heavy wood and small plumlike purple fruit
 
Chrysosplenium americanum
aquatic herb with yellowish flowers; central and western United States
 
Chrysothamnus nauseosus
pleasantly aromatic shrub having erect slender flexible hairy branches and dense clusters of small yellow flowers covering vast areas of western alkali plains and affording a retreat for jackrabbits; source of a yellow dye used by the Navajo
 
Cibotium barometz
Asiatic tree fern having dense matted hairs sometimes used as a styptic
 
Cicer arietinum
Asiatic herb cultivated for its short pods with one or two edible seeds
 
Cichorium endivia
widely cultivated herb with leaves valued as salad green; either curly serrated leaves or broad flat ones that are usually blanched
 
Cichorium intybus
perennial Old World herb having rayed flower heads with blue florets cultivated for its root and its heads of crisp edible leaves used in salads
 
Cicuta verosa
tall erect highly poisonous Eurasiatic perennial herb locally abundant in marshy areas
 
cigar-box cedar
fragrant wood much used for cigar boxes
 
Cimicifuga americana
bugbane of the eastern United States having erect racemes of white flowers
 
Cimicifuga foetida
bugbane of Siberia and eastern Asia having ill-smelling green-white flowers
 
Cimicifuga racemosa
North American bugbane found from Maine and Ontario to Wisconsin and south to Georgia
 
Cinchona cordifolia
Colombian tree; source of Cartagena bark (a cinchona bark)
 
Cinchona officinalis
Peruvian shrub or small tree having large glossy leaves and cymes of fragrant yellow to green or red flowers; cultivated for its medicinal bark
 
Cinchona pubescens
small tree of Ecuador and Peru having very large glossy leaves and large panicles of fragrant pink flowers; cultivated for its medicinal bark
 
Cineraria maritima
stiff much-branched perennial of the Mediterranean region having very white woolly stems and leaves
 
Cinnamomum camphora
large evergreen tree of warm regions whose aromatic wood yields camphor
 
Cinnamomum cassia
Chinese tree with aromatic bark; yields a less desirable cinnamon than Ceylon cinnamon
 
Cinnamomum loureirii
tropical southeast Asian tree with aromatic bark; yields a bark used medicinally
 
Cinnamomum zeylanicum
tropical Asian tree with aromatic yellowish-brown bark; source of the spice cinnamon
 
cinnamon bark
aromatic bark of Saigon cinnamon used medicinally as a carminative
 
cinnamon
aromatic bark used as a spice
 
cinquefoil
any of a numerous plants grown for their five-petaled flowers; abundant in temperate regions; alleged to have medicinal properties
 
Circaea lutetiana
tall evening primrose with inconspicuous flowers
 
Circis siliquastrum
small tree of the eastern Mediterranean having abundant purplish-red flowers growing on old wood directly from stems and appearing before the leaves: widely cultivated in mild regions; wood valuable for veneers
 
cirrhus
usually coiled
 
Cirsium arvense
European thistle naturalized in United States and Canada where it is a pernicious weed
 
Cirsium discolor
stout North American thistle with purplish-pink flower heads
 
Cirsium flodmanii
thistle of western North America having white woolly leaves
 
Cirsium heterophylum
perennial stoloniferous thistle of northern Europe with lanceolate basal leaves and usually solitary heads of reddish-purple flowers
 
Cirsium lanceolatum
European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United States
 
Cirsium rivulare
of central and southwestern Europe
 
Cistus albidus
compact white pubescent shrub of southwestern Europe having pink flowers
 
Cistus ladanifer
shrub having white flowers and viscid stems and leaves yielding a fragrant oleoresin used in perfumes especially as a fixative
 
Citroncirus webberi
more aromatic and acidic than oranges
 
citronwood
wood of a citron tree
 
citronwood
durable fragrant wood; used in building (as in the roof of the cathedral at Cordova, Spain)
 
Citrullus vulgaris
an African melon
 
Citrus aurantifolia
any of various related trees bearing limes
 
Citrus aurantium
any of various common orange trees yielding sour or bitter fruit; used as grafting stock
 
Citrus bergamia
small tree with pear-shaped fruit whose oil is used in perfumery; Italy
 
Citrus decumana
southeastern Asian tree producing large fruits resembling grapefruits
 
Citrus limetta
lemon tree having fruit with a somewhat insipid sweetish pulp
 
Citrus limon
a small evergreen tree that originated in Asia but is widely cultivated for its fruit
 
Citrus limonia
hybrid between mandarin orange and lemon having very acid fruit with orange peel
 
Citrus medica
thorny evergreen small tree or shrub of India widely cultivated for its large lemonlike fruits that have thick warty rind
 
Citrus nobilis
large citrus tree having large sweet deep orange fruit that is easily peeled; widely cultivated in Florida
 
Citrus paradisi
citrus tree bearing large round edible fruit having a thick yellow rind and juicy somewhat acid pulp
 
Citrus reticulata
shrub or small tree having flattened globose fruit with very sweet aromatic pulp and thin yellow-orange to flame-orange rind that is loose and easily removed; native to southeastern Asia
 
Citrus sinensis
probably native to southern China; widely cultivated as source of table and juice oranges
 
Citrus tangelo
hybrid between grapefruit and mandarin orange; cultivated especially in Florida
 
citrus
any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds
 
cladode
a flattened stem resembling and functioning as a leaf
 
Cladonia rangiferina
an erect greyish branching lichen of Arctic and even some north temperate regions constituting the chief food for reindeer and caribou and sometimes being eaten by humans
 
Cladrastis kentukea
small handsome roundheaded deciduous tree having showy white flowers in terminal clusters and heavy hardwood yielding yellow dye
 
class Acrasiomycetes
cellular slime molds; in some classifications placed in kingdom Protoctista
 
class Anthoceropsida
hornworts: in some classification systems included in the class Hepaticopsida
 
class Ascomycetes
large class of higher fungi coextensive with division Ascomycota: sac fungi
 
class Basidiomycetes
large class of higher fungi coextensive with subdivision Basidiomycota
 
class Bryopsida
true mosses: bryophytes having leafy rather than thalloid gametophytes: comprises orders Andreaeales; Bryales; Dicranales; Eubryales; Sphagnales
 
class Chytridiomycetes
a class of mostly aquatic fungi; saprophytic or parasitic on algae or fungi or plants
 
class Deuteromycetes
form class; coextensive with subdivision Deuteromycota
 
class Dicotyledones
comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves; divided into six (not always well distinguished) subclasses (or superorders): Magnoliidae and Hamamelidae (considered primitive); Caryophyllidae (an early and distinctive offshoot); and three more or less advanced groups: Dilleniidae; Rosidae; Asteridae
 
class Eumycetes
category used in some classifications: coextensive with division Eumycota
 
class Filicopsida
ferns
 
class Gasteromycetes
fungi in which the hymenium is enclosed until after spores have matured: puffballs; earth stars; stinkhorn fungi
 
class Hemiascomycetes
class of fungi in which no ascocarps are formed: yeasts and some plant parasites
 
class Hepaticopsida
liverworts: comprises orders Anthocerotales; Jungermanniales; Marchantiales; Sphaerocarpales
 
class Hymenomycetes
used in some classifications; usually coextensive with order Agaricales: mushrooms; toadstools; agarics; bracket fungi
 
class Lycopodiate
club mosses and related forms: includes Lycopodiales; Isoetales; Selaginellales; and extinct Lepidodendrales; sometimes considered a subdivision of Tracheophyta
 
class Lycopodineae
alternative designation for the class Lycopsida
 
class Monocotyledonae
comprising seed plants that produce an embryo with a single cotyledon and parallel-veined leaves: includes grasses and lilies and palms and orchids; divided into four subclasses or superorders: Alismatidae; Arecidae; Commelinidae; and Liliidae
 
class Myxomycetes
the class of true slime molds; essentially equivalent to the division Myxomycota
 
class Oomycetes
nonphotosynthetic fungi that resemble algae and that reproduce by forming oospores; sometimes classified as protoctists
 
class Plectomycetes
class of fungi in which the fruiting body is a cleistothecium (it releases spores only on decay or disintegration)
 
class Psilotatae
whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs
 
class Pteridospermopsida
extinct gymnosperms most of Carboniferous to Jurassic: seed ferns and allies
 
class Pyrenomycetes
class of fungi in which the fruiting body is a perithecium; includes powdery mildews and ergot and Neurospora
 
class Sphenopsida
horsetails and related forms
 
class Tiliomycetes
category used in some systems to comprise the two orders Ustilaginales (smuts) and Uredinales (rusts)
 
class Zygomycetes
class of fungi coextensive with subdivision Zygomycota
 
Clatonia lanceolata
small slender plant having one pair of succulent leaves at the middle of the stem and a loose raceme of white or pink or rose bowl-shaped flowers and an edible corm
 
Claviceps purpurea
a fungus that infects various cereal plants forming compact black masses of branching filaments that replace many grains of the plant; source of medicinally important alkaloids and of lysergic acid
 
Clavicipitaceae
any of various mushrooms of the class Ascomycetes
 
Cleistes divaricata
orchid of northeastern United States with magenta-pink flowers having funnel-shaped lip; sometimes placed in genus Pogonia
 
Cleistes rosea
orchid of central and northern South America having 1- to 3-blossomed racemes of large showy rose-colored flowers; sometimes placed in genus Pogonia
 
cleistocarp
closed spore-bearing structure of some fungi (especially Aspergillaceae and Erysiphaceae) from which spores are released only by decay or disintegration
 
clematis
any of various ornamental climbing plants of the genus Clematis usually having showy flowers
 
Clematis baldwinii
erect clematis of Florida having pink to purple flowers
 
Clematis crispa
climber of southern United States having bluish-purple flowers
 
Clematis lasiantha
clematis of California
 
Clematis ochreleuca
shrubby clematis of the eastern United States having curly foliage
 
Clematis tangutica
Chinese clematis with serrate leaves and large yellow flowers
 
Clematis texensis
woody vine of Texas having showy solitary nodding scarlet flowers
 
Clematis versicolor
woody vine of the southern United States having purple or blue flowers with leathery recurved sepals
 
Clematis verticillaris
climber of northeastern North America having waxy purplish-blue flowers
 
Clematis viorna
scandent subshrub of southeastern United States having large red-purple bell-shaped flowers with leathery recurved sepals
 
Clematis virginiana
common climber of eastern North America that sprawls over other plants and bears numerous panicles of small creamy white flowers
 
Clematis vitalba
vigorous deciduous climber of Europe to Afghanistan and Lebanon having panicles of fragrant green-white flowers in summer and autumn
 
clementine
a variety of mandarin orange that is grown around the Mediterranean and in South Africa
 
Cleome hassleriana
native to South America but naturalized in warm parts of United States; grown for its long-lasting spider-shaped white to pink-purple flowers
 
cleome
any of various often strong-smelling plants of the genus Cleome having showy spider-shaped flowers
 
Clethra alnifolia
shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers
 
Clianthus puniceus
evergreen shrub with scarlet to white clawlike or beaklike flowers; New Zealand
 
Clianthus speciosus
sprawling shrubby perennial noted for its scarlet black-marked flowers; widely distributed in dry parts of Australia
 
clianthus
any of various shrubs or vines of the genus Clianthus having compound leaves and pea-like red flowers in drooping racemes
 
cliff brake
any of several small lithophytic ferns of tropical and warm temperate regions
 
Cliftonia monophylla
tree of low-lying coastal areas of southeastern United States having glossy leaves and racemes of fragrant white flowers
 
climber
a vine or climbing plant that readily grows up a support or over other plants
 
climbing fern
any of several ferns of the genus Lygodium that climb by twining
 
Clinopodium grandiflorum
aromatic herb with large pink flowers; southern and southeastern Europe; Anatolia; northern Iran
 
Clinopodium vulgare
aromatic herb having heads of small pink or whitish flowers; widely distributed in United States, Europe and Asia
 
Clinton's lily
any temperate liliaceous plant of the genus Clintonia having broad basal leaves and white or yellowish or purplish flowers followed by blue or black berries
 
Clintonia andrewsiana
plant with nearly leafless stalk topped by a cluster of red or reddish lavender flowers; California to Oregon
 
Clintonia borealis
common woodland herb of temperate North America having yellow nodding flowers and small round blue fruits
 
Clintonia uniflora
plant with 1 or 2 white starlike flowers on short leafless stalks; Alaska to California and east to Oregon and Montana
 
Clitocybe clavipes
an agaric with a flat cap that is greyish or yellowish brown with pallid gills and a stalk that bulges toward the base
 
Clitocybe dealbata
a small poisonous agaric; has a dry white cap with crowded gills and a short stalk
 
Clitocybe inornata
a fungus with a cap that is creamy grey when young and turns brown with age and a whitish stalk that stains yellow when handled
 
Clitocybe nuda
edible agaric that is pale lilac when young; has a smooth moist cap
 
Clitocybe robusta
a large white agaric; edible but not palatable
 
Clitocybe subconnexa
an edible white agaric that fruits in dense clusters; the gills are narrow and crowded and the stalk is fleshy and unpolished
 
Clitoria mariana
large-flowered wild twining vine of southeastern and central United States having pale blue flowers
 
Clitoria turnatea
vine of tropical Asia having pinnate leaves and bright blue flowers with yellow centers
 
clove
aromatic flower bud of a clove tree; yields a spice
 
clover fern
any of several water ferns of the genus Marsilea having four leaflets
 
clover
a plant of the genus Trifolium
 
club fungus
a club-shaped coral fungus
 
club moss
primitive evergreen moss-like plant with spores in club-shaped strobiles
 
clusia
an aromatic tree of the genus Clusia having large white or yellow or pink flowers
 
Clusia flava
a West Indies clusia having fig-shaped fruit
 
Clusia insignis
epiphytic clusia of British Guiana
 
Clusia rosea
a common tropical American clusia having solitary white or rose flowers
 
Cnicus benedictus
annual of Mediterranean to Portugal having hairy stems and minutely spiny-toothed leaves and large heads of yellow flowers
 
Cocculus carolinus
woody vine of southeastern United States resembling the common moonseed but having red fruits
 
Cochlearia officinalis
a widely distributed Arctic cress reputed to have value in treatment or prevention of scurvy; a concentrated source of vitamin C
 
cocklebur
any coarse weed of the genus Xanthium having spiny burrs
 
Cocos nucifera
tall palm tree bearing coconuts as fruits; widely planted throughout the tropics
 
cocoswood
wood of the granadilla tree used for making musical instruments especially clarinets
 
cocoyam
edible starchy tuberous root of taro plants
 
cod
the vessel that contains the seeds of a plant (not the seeds themselves)
 
Codariocalyx motorius
erect tropical Asian shrub whose small lateral leaflets rotate on their axes and jerk up and down under the influence of sunshine
 
Codiaeum variegatum
grown in many varieties for their brightly colored foliage; widely cultivated as a houseplant
 
Coeloglossum bracteatum
orchid with broad ovate leaves and long-bracted green very irregular flowers
 
Coeloglossum viride
orchid having hooded long-bracted green to yellow-green flowers suffused with purple
 
coelogyne
any of various orchids of the genus Coelogyne with: clusters of fragrant lacy snow-white flowers; salmon-pink solitary flowers; chainlike racemes of topaz and chocolate brown flowers; spikes of delicate white spice-scented flowers; emerald green flowers marked with blue-black
 
Coffea arabica
shrubby tree of northeastern tropical Africa widely cultivated in tropical or near tropical regions for its seed which form most of the commercial coffee
 
Coffea canephora
native to West Africa but grown in Java and elsewhere; resistant to coffee rust
 
coffee
any of several small trees and shrubs native to the tropical Old World yielding coffee beans
 
cohune fat
semisolid fat from nuts of the cohune palm; used in cooking and soap making
 
cohune nut
nut of the cohune palm having hard white shells like those of ivory nuts
 
coir
stiff coarse fiber from the outer husk of a coconut
 
Cola acuminata
tree bearing large brown nuts containing e.g. caffeine; source of cola extract
 
cola nut
bitter brown seed containing caffein; source of cola extract
 
Colchicum autumnale
bulbous autumn-flowering herb with white, purple or lavender-and-white flowers; native to western and central Europe
 
coleus
any of various Old World tropical plants of the genus Coleus having multicolored decorative leaves and spikes of blue flowers
 
colic root
any of several perennials of the genus Aletris having grasslike leaves and bitter roots reputed to cure colic
 
collard
variety of kale having smooth leaves
 
Collinsia heterophylla
white and lavender to pale-blue flowers grow in perfect rings of widely spaced bands around the stems forming a kind of pagoda; California
 
Collinsia verna
eastern United States plant with whorls of blue-and-white flowers
 
Collinsonia canadensis
erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States
 
Colocasia esculenta
herb of the Pacific islands grown throughout the tropics for its edible root and in temperate areas as an ornamental for its large glossy leaves
 
Colorado blue spruce
tall spruce with blue-green needles and dense conic crown; older trees become columnar with lower branches sweeping downward
 
Colorado four o'clock
wildflower having vibrant deep pink tubular evening-blooming flowers; found in sandy and desert areas from southern California to southern Colorado and into Mexico
 
Colorado River hemp
tall-growing annual of southwestern United States widely grown as green manure; yields a strong tough bast fiber formerly used by Indians for cordage
 
Columbia tiger lily
lily of western North America with showy orange-red purple-spotted flowers
 
columnea
tropical plant having thick hairy somewhat toothed leaves and solitary or clustered yellow to scarlet flowers; many cultivated for their flowers and ornamental foliage
 
Colutea arborescens
yellow-flowered European shrub cultivated for its succession of yellow flowers and very inflated bladdery pods and as a source of wildlife food
 
colza oil
edible light yellow to brown oil from rapeseed used also as a lubricant or illuminant
 
coma
(botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds)
 
Comandra pallida
woody creeping parasite of western North America having numerous thick powdery leaves and panicles of small dull-white flowers
 
combretum
any of numerous shrubs or small trees of the genus Combretum having spikes of small flowers
 
Combretum appiculatum
small deciduous tree of the Transvaal having spikes of yellow flowers
 
Combretum bracteosum
ornamental African shrub or climber with red flowers
 
Combretum erythrophyllum
small South African tree having creamy yellow fragrant flowers usually growing on stream banks
 
comfrey
perennial herbs of Europe and Iran; make rapidly growing groundcover for shaded areas
 
commelina
any plant of the genus Commelina
 
Commiphora meccanensis
small evergreen tree of Africa and Asia; leaves have a strong aromatic odor when bruised
 
Commiphora myrrha
tree of eastern Africa and Asia yielding myrrh
 
common arrowhead
a weed
 
common European ash
tall ash of Europe to the Caucasus having leaves shiny dark-green above and pale downy beneath
 
common European dogwood
European deciduous shrub turning red in autumn having dull white flowers
 
common winterberry holly
a holly shrub
 
compass flower
any of several plants having leaves so arranged on the axis as to indicate the cardinal points of the compass
 
composite
considered the most highly evolved dicotyledonous plants, characterized by florets arranged in dense heads that resemble single flowers
 
compound leaf
a leaf composed of a number of leaflets on a common stalk
 
compound pistil
consists of two or more fused carpels
 
Comptonia asplenifolia
deciduous shrub of eastern North America with sweet scented fernlike leaves and tiny white flowers
 
cone
cone-shaped mass of ovule- or spore-bearing scales or bracts
 
coneflower
a wildflower of the genus Ratibida
 
coneflower
any of various plants of the genus Rudbeckia cultivated for their large usually yellow daisies with prominent central cones
 
coneflower
any of various perennials of the eastern United States having thick rough leaves and long-stalked showy flowers with drooping rays and a conelike center
 
Confederate rose mallow
Chinese shrub or small tree having white or pink flowers becoming deep red at night; widely cultivated; naturalized in southeastern United States
 
conidiophore
a specialized fungal hypha that produces conidia
 
conidiospore
an asexually produced fungal spore formed on a conidiophore
 
conifer
any gymnospermous tree or shrub bearing cones
 
Coniogramme japonica
fast-growing sturdy Japanese fern; cultivated for their attractive broad dark-green pinnate fronds
 
Conium maculatum
large branching biennial herb native to Eurasia and Africa and adventive in North America having large fernlike leaves and white flowers; usually found in damp habitats; all parts extremely poisonous
 
Connarus guianensis
tropical American and east African tree with strikingly marked hardwood used in cabinetwork
 
Conocarpus erectus
evergreen tree or shrub with fruit resembling buttons and yielding heavy hard compact wood
 
Conoclinium coelestinum
rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium
 
Conopodium denudatum
a common European plant having edible tubers with the flavor of roasted chestnuts
 
Convallaria majalis
low-growing perennial plant having usually two large oblong lanceolate leaves and a raceme of small fragrant nodding bell-shaped flowers followed by scarlet berries
 
convolvulus
any of numerous plants of the genus Convolvulus
 
Convolvulus arvensis
weakly climbing European perennial with white or pink flowers; naturalized in North America and an invasive weed
 
Convolvulus scammonia
twining plant of Asia Minor having cream-colored to purple flowers and long thick roots yielding a cathartic resin
 
Convolvulus sepium
common Eurasian and American wild climber with pink flowers; sometimes placed in genus Convolvulus
 
Copernicia australis
South American palm yielding a wax similar to carnauba wax
 
Copernicia prunifera
Brazilian fan palm having an edible root; source of a useful leaf fiber and a brittle yellowish wax
 
Coprinus atramentarius
having a cap that melts into an inky fluid after spores have matured
 
Coprinus comatus
common edible mushroom having an elongated shaggy white cap and black spores
 
Coptis trifolia groenlandica
low-growing perennial of North America woodlands having trifoliate leaves and yellow rootstock and white flowers
 
coquilla nut
nut having a hard hazel-brown shell used like vegetable ivory
 
coral fungus
any of numerous fungi of the family Clavariaceae often brightly colored that grow in often intricately branched clusters like coral
 
coral pea
any of various Australian climbing plants of the genus Kennedia having scarlet flowers
 
coral root
a wildflower of the genus Corallorhiza growing from a hard mass of rhizomes associated with a fungus that aids in absorbing nutrients from the forest floor
 
coral tree
any of various shrubs or shrubby trees of the genus Erythrina having trifoliate leaves and racemes of scarlet to coral red flowers and black seeds; cultivated as an ornamental
 
Corallorhiza maculata
common coral root having yellowish- or reddish- or purplish-brown leafless stems bearing loose racemes of similarly colored flowers with white purple-spotted lips; Guatemala to Canada
 
Corallorhiza striata
nearly leafless wildflower with erect reddish-purple stems bearing racemes of pale pinkish and brownish-striped flowers; western Canada to Mexico
 
Corallorhiza trifida
plant having clumps of nearly leafless pale yellowish to greenish stems bearing similarly colored flowers with white lower lips; northern New Mexico north through South Dakota and Washington to Alaska
 
corchorus
any of various plants of the genus Corchorus having large leaves and cymose clusters of yellow flowers; a source of jute
 
cord grass
any of several perennial grasses of the genus Spartina; some important as coastal soil binders
 
cordate leaf
a heart-shaped leaf
 
Cordia alliodora
large tropical American tree of the genus Cordia grown for its abundant creamy white flowers and valuable wood
 
Cordia gerascanthus
tropical American timber tree
 
Cordyline australis
elegant tree having either a single trunk or a branching trunk each with terminal clusters of long narrow leaves and large panicles of fragrant white, yellow or red flowers; New Zealand
 
Cordyline terminalis
shrub with terminal tufts of elongated leaves used locally for thatching and clothing; thick sweet roots are used as food; tropical southeastern Asia, Australia and Hawaii
 
Coreopsis gigantea
large treelike shrub having feathery leaves and clusters of large yellow flower heads; coastal southern California
 
Coreopsis maritima
stout herb with flowers one to a stalk; ornamental developed from a Mexican wildflower
 
Coreopsis tinctoria
North American annual widely cultivated for its yellow flowers with purple-red to brownish centers; in some classifications placed in a subgenus Calliopsis
 
coreopsis
any of numerous plants of the genus Coreopsis having a profusion of showy usually yellow daisylike flowers over long periods; North and South America
 
Coriandrum sativum
Old World herb with aromatic leaves and seed resembling parsley
 
corm
solid swollen underground bulb-shaped stem or stem base and serving as a reproductive structure
 
cormous plant
plant growing from a corm
 
corn
(Great Britain) any of various cereal plants (especially the dominant crop of the region--wheat in Great Britain or oats in Scotland and Ireland)
 
corn
the dried grains or kernels or corn used as animal feed or ground for meal
 
corn lily
any of several South African plants of the genus Ixia having grasslike leaves and clusters of showy variously colored lily-like flowers; widely cultivated
 
corn salad
a plant of the genus Valerianella
 
corn silk
each of the long filamentous styles that grow as a silky tuft at the tip of an ear of Indian corn
 
corn smut
a smut fungus attacking Indian corn
 
corn stalk
the stalk of a corn plant
 
cornel
a tree of shrub of the genus Cornus often having showy bracts resembling flowers
 
cornhusk
the husk of an ear of corn
 
Cornish heath
bushy shrub having pink to white flowers; common on the moors of Cornwall and in southwestern Europe; cultivated elsewhere
 
Cornus amomum
shrub of eastern North America having purplish stems and blue fruit
 
Cornus canadensis
creeping perennial herb distinguished by red berries and clustered leaf whorls at the tips of shoots; Greenland to Alaska
 
Cornus florida
deciduous tree; celebrated for its large white or pink bracts and stunning autumn color that is followed by red berries
 
Cornus mas
deciduous European shrub or small tree having bright red fruit
 
Cornus obliqua
shrub of eastern North America closely resembling silky cornel
 
Cornus stolonifera
common North American shrub with reddish purple twigs and white flowers
 
corolla
(botany) the whorl of petals of a flower that collectively form an inner floral envelope or layer of the perianth
 
corona
(botany) the trumpet-shaped or cup-shaped outgrowth of the corolla of a daffodil or narcissus flower
 
coronilla
any of various plants of the genus Coronilla having purple or pink or yellow flowers in long axillary heads or umbels
 
Coronilla varia
European herb resembling vetch; naturalized in the eastern United States; having umbels of pink-and-white flowers and sharp-angled pods
 
corozo
any of several tropical American palms bearing corozo nuts
 
Cortaderia richardii
tall grass of New Zealand grown for plumelike flower heads
 
Cortaderia selloana
tall perennial grass of pampas of South America having silvery plumes and growing in large dense clumps
 
Corticium salmonicolor
fungus causing pink disease in citrus and coffee and rubber trees etc
 
Corticium solani
fungus causing bottom rot in lettuce
 
cortina
a cobwebby partial veil consisting of silky fibrils
 
Cortinarius armillatus
a fungus with large tawny caps and pale cinnamon gills and a red band of veil around the stalk; usually found near birch trees
 
Cortinarius atkinsonianus
an edible fungus with a slimy viscid cap that is initially yellow but turns olive and then tawny; flesh is lavender
 
Cortinarius corrugatus
a fungus with a viscid wrinkled tawny cap; the stalk has a basal bulb that diminishes as the stalk elongates; the gills are dark violet at first but soon turn brown
 
Cortinarius gentilis
a poisonous fungus with a bright yellow brown cap and a long cinnamon colored stalk
 
Cortinarius semisanguineus
a fungus with a dry brown cap and rusty red gills and a yellowish stalk
 
Cortinarius subfoetidus
a fungus with a sticky lavender cap and stalk that whitish above and covered with a silky lavender sheath
 
Cortinarius violaceus
a fungus that is violet overall with a squamulose cap
 
corydalis
a plant of the genus Corydalis with beautiful compound foliage and spurred tubular flowers
 
Corydalis claviculata
annual vine with decompound leaves and racemes of yellow and pink flowers
 
Corydalis sempervirens
glaucous herb of northeastern United States and Canada having loose racemes of yellow-tipped pink flowers; sometimes placed in genus Fumaria
 
Corydalis solida
herb of northern Europe and Asia having erect racemes of red flowers
 
Corylus americana
nut-bearing shrub of eastern North America
 
Corylus avellana grandis
small nut-bearing tree much grown in Europe
 
Corylus cornuta
hazel of western United States with conspicuous beaklike involucres on the nuts
 
corymb
flat-topped or convex inflorescence in which the individual flower stalks grow upward from various points on the main stem to approximately the same height; outer flowers open first
 
Corypha gebanga
large-leaved palm of Malay to Philippines and northern Australia; leaves used for thatching or plaiting into containers
 
Corypha umbraculifera
tall palm of southern India and Sri Lanka with gigantic leaves used as umbrellas and fans or cut into strips for writing paper
 
coryphantha
a cactus of the genus Coryphantha
 
cosmea
any of various mostly Mexican herbs of the genus Cosmos having radiate heads of variously colored flowers and pinnate leaves; popular fall-blooming annuals
 
Cotinus americanus
shrubby tree of southern United States having large plumes of feathery flowers resembling puffs of smoke
 
Cotinus coggygria
Old World shrub having large plumes of yellowish feathery flowers resembling puffs of smoke
 
cotoneaster
any shrub of the genus Cotoneaster: erect or creeping shrubs having richly colored autumn foliage and many small white to pinkish flowers followed by tiny red or black fruits
 
Cotoneaster dammeri
climbing evergreen shrub with white flowers and red berries; often used as ground cover
 
Cotoneaster horizontalis
deciduous flat-growing shrub with a fanned herringbone pattern and having reddish flowers and orange-red berries; used as a ground cover
 
cottage tulip
any of several long-stemmed tulips that flower in May; have egg-shaped variously colored flowers
 
cotton grass
any sedge of the genus Eriophorum; north temperate bog plants with tufted spikes
 
cotton rose
any plant of the genus Filago having capitate clusters of small woolly flower heads
 
cotton
erect bushy mallow plant or small tree bearing bolls containing seeds with many long hairy fibers
 
cottonseed
seed of cotton plants; source of cottonseed oil
 
cottonweed
any of various plants of the genus Froelichia found in sandy soils and on rocky slopes in warmer regions of America; grown for their spikes of woolly white flowers
 
cottonwood
any of several North American trees of the genus Populus having a tuft of cottony hairs on the seed
 
Cotula coronopifolia
South African herb with golden-yellow globose flower heads; naturalized in moist areas along coast of California; cultivated as an ornamental
 
cotyledon
embryonic leaf in seed-bearing plants
 
coumara nut
fragrant black nutlike seeds of the tonka bean tree; used in perfumes and medicines and as a substitute for vanilla
 
Coumarouna odorata
tall tropical South American tree having pulpy egg-shaped pods of fragrant black almond-shaped seeds used for flavoring
 
courbaril copal
resin from the courbaril tree
 
courgette
marrow squash plant whose fruit are eaten when small
 
cover crop
crop planted to prevent soil erosion and provide green manure
 
covered smut
a smut fungus causing a smut disease of grains in which the spore masses are covered or held together by the grain membranes
 
cowage
pods of the cowage plant or the stinging hairs covering them; used as a vermifuge when mixed with e.g. honey
 
crab apple
any of numerous varieties of crab apples cultivated for their small acidic (usually bright red) fruit used for preserves or as ornamentals for their blossoms
 
crab apple
any of numerous wild apple trees usually with small acidic fruit
 
crab grass
grasses with creeping stems that root freely; a pest in lawns
 
Crambe maritima
perennial of coastal sands and shingles of northern Europe and Baltic and Black Seas having racemes of small white flowers and large fleshy blue-green leaves often used as potherbs
 
cranberry
any of numerous shrubs of genus Vaccinium bearing cranberries
 
crane's bill
any of numerous geraniums of the genus Geranium
 
Crataegus aestivalis
hawthorn of southern United States bearing a juicy, acidic, scarlet fruit that is often used in jellies or preserves
 
Crataegus biltmoreana
common shrub or small tree of the eastern United States having few thorns and white flowers in corymbs followed by bright orange-red berries
 
Crataegus calpodendron
erect and almost thornless American hawthorn with somewhat pear-shaped berries
 
Crataegus coccinea mollis
American red-fruited hawthorn with stems and leaves densely covered with short woolly hairs
 
Crataegus crus-galli
eastern United States hawthorn with long straight thorns
 
Crataegus marshallii
southern United States hawthorn with pinnately lobed leaves
 
Crataegus monogyna
European hawthorn having deeply cleft leaves and bright red fruits; widely cultivated in many varieties and often grown as impenetrable hedges; established as an escape in eastern North America
 
Crataegus oxyacantha
evergreen hawthorn of southeastern Europe
 
Crataegus oxycantha
thorny Eurasian shrub of small tree having dense clusters of white to scarlet flowers followed by deep red berries; established as an escape in eastern North America
 
Crataegus pedicellata
American red-fruited hawthorn with dense corymbs of pink-red flowers
 
crazy weed
any of several leguminous plants of western North America causing locoism in livestock
 
creeper
any plant (as ivy or periwinkle) that grows by creeping
 
creeping St John's wort
creeping evergreen shrub with bright yellow star-shaped summer flowers; useful as ground cover
 
crenate leaf
a leaf having a scalloped margin
 
Crescentia cujete
tropical American evergreen that produces large round gourds
 
cress
any of various plants of the family Cruciferae with edible leaves that have a pungent taste
 
crocus
any of numerous low-growing plants of the genus Crocus having slender grasslike leaves and white or yellow or purple flowers; native chiefly to the Mediterranean region but widely cultivated
 
Crocus sativus
Old World crocus having purple or white flowers with aromatic pungent orange stigmas used in flavoring food
 
Cronartium ribicola
fungus causing white pine blister rust and having a complex life cycle requiring a plant of genus Ribes as alternate host
 
crooked-stemmed aster
a variety of aster
 
crop
a cultivated plant that is grown commercially on a large scale
 
crop
the yield from plants in a single growing season
 
crotal
any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made
 
Crotalaria sagitallis
tropical American annual herb having an inflated pod in which the ripe seeds rattle
 
Crotalaria spectabilis
erect subshrub having purple-tinted flowers and an inflated pod in which the ripe seeds rattle; India
 
crotalaria
any of various plants of the genus Crotalaria having inflated pods within which the seeds rattle; used for pasture and green-manure crops
 
Croton eluteria
West Indian shrub with aromatic bark
 
croton oil
viscid acrid brownish-yellow oil from the seeds of Croton tiglium having a violent cathartic action
 
Croton tiglium
tropical Asiatic shrub; source of croton oil
 
crowberry
a low evergreen shrub with small purple flowers and black berrylike fruit
 
crown beard
any plant of the genus Verbesina having clustered white or yellow flower heads
 
crown
the upper branches and leaves of a tree or other plant
 
crucifer
any of various plants of the family Cruciferae
 
crustose thallus
thin crusty lichen thallus; adheres closely to or is embedded in the surface on which it grows
 
cryptocoryne
any plant of the genus Cryptocoryne; evergreen perennials growing in fresh or brackish water; tropical Asia
 
cryptogam
formerly recognized taxonomic group including all flowerless and seedless plants that reproduce by means of spores: ferns, mosses, algae, fungi
 
Cryptogamia
in former classification systems: one of two major plant divisions, including all plants that do not bear seeds: ferns, mosses, algae, fungi
 
Cryptogramma acrostichoides
rock-inhabiting fern of northern North America growing in massive tufts and having fronds resembling parsley
 
Cryptomeria japonica
tall evergreen of Japan and China yielding valuable soft wood
 
cube
any of several tropical American woody plants of the genus Lonchocarpus whose roots are used locally as a fish poison and commercially as a source of rotenone
 
cubeb
spicy fruit of the cubeb vine; when dried and crushed is used medicinally or in perfumery and sometimes smoked in cigarettes
 
Cucumis melo
any of several varieties of vine whose fruit has a netted rind and edible flesh and a musky smell
 
Cucumis melo cantalupensis
a variety of muskmelon vine having fruit with a tan rind and orange flesh
 
Cucumis melo inodorus
any of a variety of muskmelon vines having fruit with a smooth white rind and white or greenish flesh that does not have a musky smell
 
Cucumis melo reticulatus
a muskmelon vine with fruit that has a thin reticulated rind and sweet green flesh
 
Cucumis sativus
a melon vine of the genus Cucumis; cultivated from earliest times for its cylindrical green fruit
 
cucurbit
any plant of the family Cucurbitaceae
 
Cucurbita argyrosperma
plant bearing squash having globose to ovoid fruit with variously striped grey and green and white warty rinds
 
Cucurbita foetidissima
perennial vine of dry parts of central and southwestern United States and Mexico having small hard mottled green inedible fruit
 
Cucurbita maxima
plant bearing buff-colored squash having somewhat bottle-shaped fruit with fine-textured edible flesh and a smooth thin rind
 
Cucurbita maxima
any of several winter squash plants producing large greyish-green football-shaped fruit with a rough warty rind
 
Cucurbita maxima turbaniformis
squash plants bearing hard-shelled fruit shaped somewhat like a turban with a rounded central portion protruding from the end opposite the stem
 
Cucurbita moschata
any of various plants bearing squash having hard rinds and elongated recurved necks
 
Cucurbita pepo
a coarse vine widely cultivated for its large pulpy round orange fruit with firm orange skin and numerous seeds; subspecies of Cucurbita pepo include the summer squashes and a few autumn squashes
 
Cucurbita pepo melopepo
any of various usually bushy plants producing fruit that is eaten while immature and before the rind or seeds harden
 
cudweed
any of numerous plants of the genus Gnaphalium having flowers that can be dried without loss of form or color
 
Culcita dubia
resembles Pteridium aquilinum; of Queensland, Australia
 
culm
stem of plants of the Gramineae
 
cultivar
a variety of a plant developed from a natural species and maintained under cultivation
 
cultivated parsnip
European biennial having a long fusiform root that has been made palatable through cultivation
 
cultivated plant
plants that are grown for their produce
 
Cuminum cyminum
dwarf Mediterranean annual long cultivated for its aromatic seeds
 
cumquat
any of several trees or shrubs of the genus Fortunella bearing small orange-colored edible fruits with thick sweet-flavored skin and sour pulp
 
cuneate leaf
a wedge-shaped leaf having the acute angle at the base
 
cup
cup-shaped plant organ
 
cup fungus
any fungus that is a member of the subclass Discomycetes
 
cupflower
any of various plants of the genus Nierembergia having upturned bell-shaped flowers
 
Cupressus arizonica
Arizona timber tree with bluish silvery foliage
 
Cupressus goveniana
small sometimes shrubby tree native to California; often used as an ornamental; in some classification systems includes the pygmy cypress and the Santa Cruz cypress
 
Cupressus goveniana abramsiana
rare California cypress taller than but closely related to gowen cypress and sometimes considered the same species
 
Cupressus goveniana pigmaea
rare small cypress native to northern California; sometimes considered the same species as gowen cypress
 
Cupressus guadalupensis
relatively low wide-spreading endemic on Guadalupe Island; cultivated for its bluish foliage
 
Cupressus lusitanica
tall spreading evergreen found in Mexico having drooping branches; believed to have been introduced into Portugal from Goa
 
Cupressus macrocarpa
tall California cypress endemic on Monterey Bay; widely used for ornament as well as reforestation and shelterbelt planting
 
Cupressus sempervirens
tall Eurasian cypress with thin grey bark and ascending branches
 
Curcuma domestica
widely cultivated tropical plant of India having yellow flowers and a large aromatic deep yellow rhizome; source of a condiment and a yellow dye
 
currant
any of various deciduous shrubs of the genus Ribes bearing currants
 
Cuscuta gronovii
leafless parasitic vine with dense clusters of small white bell-shaped flowers on orange-yellow stems that twine around clover or flax
 
custard apple
any of several tropical American trees bearing fruit with soft edible pulp
 
cutch
tannin extract derived from any of several mangrove barks of Pacific areas
 
cutting
a part (sometimes a root or leaf or bud) removed from a plant to propagate a new plant through rooting or grafting
 
Cyamopsis tetragonolobus
drought-tolerant herb grown for forage and for its seed which yield a gum used as a thickening agent or sizing material
 
Cyathea medullaris
a showy tree fern of New Zealand and Australia having a crown of pinnated fronds with whitish undersides
 
cycad
any tropical gymnosperm of the order Cycadales; having unbranched stems with a crown of fernlike leaves
 
Cycas circinalis
southeastern Indian cycad with palmlike foliage
 
Cycas revoluta
dwarf palmlike cycad of Japan that yields sago
 
Cyclamen neopolitanum
common wild European cyclamen with pink flowers
 
Cyclamen purpurascens
Mediterranean plant widely cultivated as a houseplant for its showy dark green leaves splotched with silver and nodding white or pink to reddish flowers with reflexed petals
 
Cycloloma atriplicifolium
bushy annual weed of central North America having greenish flowers and winged seeds
 
Cyclophorus lingua
east Asian fern having fronds shaped like tongues; sometimes placed in genus Cyclophorus
 
Cydonia oblonga
small Asian tree with pinkish flowers and pear-shaped fruit; widely cultivated
 
cymbid
any of various plants of the genus Cymbidium having narrow leaves and a long drooping cluster of numerous showy and variously colored boat-shaped flowers; extensively hybridized and cultivated as houseplants and important florists' flowers
 
cyme
more or less flat-topped cluster of flowers in which the central or terminal flower opens first
 
cymling
squash plant having flattened round fruit with a scalloped edge; usually greenish white
 
cymule
a small cyme, generally with few flowers
 
cynancum
any of various mostly giant tropical lianas of Africa and Madagascar having greenish or purple flowers and long smooth pods; roots formerly used as an emetic
 
Cynara cardunculus
southern European plant having spiny leaves and purple flowers cultivated for its edible leafstalks and roots
 
Cynara scolymus
Mediterranean thistlelike plant widely cultivated for its large edible flower head
 
Cynodon dactylon
trailing grass native to Europe now cosmopolitan in warm regions; used for lawns and pastures especially in southern United States and India
 
Cynodon plectostachyum
perennial grass having stems 3 to 4 feet high; used especially in Africa and India for pasture and hay
 
Cynoglossum officinale
biennial shrub of Europe and western Asia having coarse tongue-shaped leaves and dark reddish-purple flowers
 
Cynoglossum virginaticum
perennial shrub of North America having coarse tongue-shaped leaves and pale-blue to purple flowers
 
Cyperus alternifolius
African sedge widely cultivated as an ornamental water plant for its terminal umbrellalike cluster of slender grasslike leaves
 
Cyperus esculentus
European sedge having small edible nutlike tubers
 
Cyperus longus
European sedge having rough-edged leaves and spikelets of reddish flowers and aromatic roots
 
Cyperus rotundus
a widely distributed perennial sedge having small edible nutlike tubers
 
cypress
wood of any of various cypress trees especially of the genus Cupressus
 
cypress pine
any of several evergreen trees or shrubs of Australia and northern New Caledonia
 
cypress
any of numerous evergreen conifers of the genus Cupressus of north temperate regions having dark scalelike leaves and rounded cones
 
cypripedia
a plant or flower of the genus Cypripedium
 
Cypripedium acaule
once common rose pink woodland orchid of eastern North America
 
Cypripedium arietinum
orchid of northern North America having a brownish-green flower and red-and-white lip suggestive of a ram's head
 
Cypripedium calceolus pubescens
plant of eastern and central North America having slightly fragrant purple-marked greenish-yellow flowers
 
Cypripedium fasciculatum
clusters of several short stems each having 2 broad leaves and 2-4 drooping brownish to greenish flowers with pouches mottled with purple; British Columbia to central California and northern Colorado
 
Cypripedium montanum
leafy plant having a few stems in a clump with 1 white and dull purple flower in each upper leaf axil; Alaska to northern California and Wyoming
 
Cypripedium parviflorum
maroon to purple-brown orchid with yellow lip; Europe, North America and Japan
 
Cypripedium reginae
pale pink wild orchid of northeastern America having an inflated pouchlike lip
 
Cyrilla racemiflora
shrub or small tree of southeastern United States to West Indies and Brazil; grown for the slender racemes of white flowers and orange and crimson foliage
 
Cystopteris bulbifera
North American fern often bearing bulbils on the leaflets
 
Cystopteris fragilis
delicate fern widely distributed in North America and European having thin pinnatifid fronds with brittle stems
 
Cystopteris montana
fern of rocky mountainous areas of hemisphere
 
Cytisus multiflorus
low European broom having trifoliate leaves and yellowish-white flowers
 
Cytisus ramentaceus
erect shrub having large trifoliate leaves and dense clusters of yellow flowers followed by poisonous seeds; Yugoslavia; sometimes placed in genus Cytisus
 
Cytisus scoparius
deciduous erect spreading broom native to western Europe; widely cultivated for its rich yellow flowers
 
Daboecia cantabrica
low straggling evergreen shrub of western Europe represented by several varieties with flowers from white to rose-purple
 
Dacrycarpus dacrydioides
New Zealand evergreen valued for its light easily worked wood
 
Dacrydium colensoi
New Zealand silver pine of conical habit with long slender flexuous branches; adapted to cold wet summers and high altitudes
 
Dacrydium cupressinum
tall New Zealand timber tree
 
Dactylis glomerata
widely grown stout Old World hay and pasture grass
 
Dactyloctenium aegypticum
a creeping grass with spikes like fingers
 
Dactylorhiza maculata fuchsii
European orchid having lanceolate leaves spotted purple and pink to white or mauve flowers spotted or lined deep red or purple
 
Dahlia pinnata
any of several plants of or developed from the species Dahlia pinnata having tuberous roots and showy rayed variously colored flower heads; native to the mountains of Mexico and Central America and Colombia
 
daily dew
any of various bog plants of the genus Drosera having leaves covered with sticky hairs that trap and digest insects; cosmopolitan in distribution
 
daisy
any of numerous composite plants having flower heads with well-developed ray flowers usually arranged in a single whorl
 
daisy bush
any of various mostly Australian attractively shaped shrubs of the genus Olearia grown for their handsome and sometimes fragrant evergreen foliage and profusion of daisy flowers with white or purple or blue rays
 
Dalbergia cearensis
Brazilian tree yielding a handsome cabinet wood
 
Dalbergia retusa
a valuable timber tree of tropical South America
 
Dalbergia sissoo
East Indian tree whose leaves are used for fodder; yields a compact dark brown durable timber used in shipbuilding and making railroad ties
 
Dalbergia stevensonii
Central American tree yielding a valuable dark streaked rosewood
 
Dalea spinosa
greyish-green shrub of desert regions of southwestern United States and Mexico having sparse foliage and terminal spikes of bluish violet flowers; locally important as source of a light-colored honey of excellent flavor
 
Dalmatian iris
European iris having soft lilac-blue flowers
 
dammar pine
any of various trees of the genus Agathis; yield dammar resin
 
dandelion green
the foliage of the dandelion plant
 
daphne
any of several ornamental shrubs with shiny mostly evergreen leaves and clusters of small bell-shaped flowers
 
Daphne cneorum
widely cultivated low evergreen shrub with dense clusters of fragrant pink to deep rose flowers
 
Daphne laureola
bushy Eurasian shrub with glossy leathery oblong leaves and yellow-green flowers
 
darling pea
either of two Australian plants of the genus Swainsona that are poisonous to sheep
 
Darlingtonia californica
marsh or bog herb having solitary pendulous yellow-green flowers and somewhat twisted pitchers with broad wings below
 
Darwin tulip
any of several very tall, late blooming tulips bearing large squarish flowers on sturdy stems
 
Datura stramonium
intensely poisonous tall coarse annual tropical weed having rank-smelling foliage, large white or violet trumpet-shaped flowers and prickly fruits
 
Daucus carota sativa
perennial plant widely cultivated as an annual in many varieties for its long conical orange edible roots; temperate and tropical regions
 
daughter cell
a cell formed by the division or budding of another cell
 
Davalia bullata mariesii
feathery fern of tropical Asia and Malaysia
 
davallia
any fern of the genus Davallia; having scaly creeping rhizomes
 
day lily
any of numerous perennials having tuberous roots and long narrow bladelike leaves and usually yellow lily-like flowers that bloom for only a day
 
day lily
any of numerous perennials having mounds of sumptuous broad ribbed leaves and clusters of white, blue, or lilac flowers; used as ground cover
 
dayflower
any plant of the family Commelinaceae
 
dead nettle
any of various plants of the genus Lamium having clusters of small usually purplish flowers with two lips
 
deadwood
a branch or a part of a tree that is dead
 
death camas
any of various plants of the genus Zigadenus having glaucous leaves and terminal racemes of mostly white flowers; all are poisonous
 
deccan hemp
fiber from an East Indian plant Hibiscus cannabinus
 
deciduous holly
a holly tree
 
deciduous plant
a plant having foliage that is shed annually at the end of the growing season
 
decompound leaf
a leaf having divisions that are themselves compound
 
Decumaria barbata
woody climber of southeastern United States having white flowers in compound terminal clusters
 
deer grass
any of several plants of the genus Rhexia usually having pink-purple to magenta flowers; eastern North America
 
delphinium
any plant of the genus Delphinium having palmately divided leaves and showy spikes of variously colored spurred flowers; some contain extremely poisonous substances
 
Delphinium ajacis
commonly cultivated larkspur of southern Europe having unbranched spikelike racemes of blue or sometimes purplish or pinkish flowers; sometime placed in genus Delphinium
 
deltoid leaf
a simple leaf shaped like a capital delta
 
Dendranthema grandifloruom
of China
 
dendrobium
a plant of the genus Dendrobium having stems like cane and usually showy racemose flowers
 
Dendrocalamus giganteus
immense tropical southeast Asian bamboo with tough hollow culms that resemble tree trunks
 
Dennstaedtia punctilobula
fern of eastern North America with pale green fronds and an aroma like hay
 
dentate leaf
a leaf having a toothed margin
 
denticulate leaf
a leaf having a finely toothed margin; minutely dentate
 
derris
any of various usually woody vines of the genus Derris of tropical Asia whose roots yield the insecticide rotenone; several are sources of native fish and arrow poisons
 
Derris elliptica
woody vine having bright green leaves and racemes of rose-tinted white flowers; the swollen roots contain rotenone
 
Descurainia pinnata
North American herb with bitter-tasting pinnate leaves resembling those of tansy
 
desert plant
plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte
 
Desmanthus ilinoensis
perennial herb of North American prairies having dense heads of small white flowers
 
Desmodium tortuosum
West Indian forage plant cultivated in southern United States as forage and to improve soil
 
deutzia
any of various shrubs of the genus Deutzia having usually toothed opposite leaves and shredding bark and white or pink flowers in loose terminal clusters
 
devil's cigar
a common name for a variety of Sarcosomataceae
 
devil's urn
a common name for a variety of Sarcosomataceae
 
dewberry
any of several trailing blackberry brambles especially of North America
 
dhava
an Indian tree of the family Combretaceae that is a source of timber and gum
 
Diangus gratianopolitanus
mat-forming perennial of central Europe with large fragrant pink or red flowers
 
Dianthus barbatus
Eurasian pink widely cultivated for its flat-topped dense clusters of varicolored flowers
 
Dianthus caryophyllus
Eurasian plant with pink to purple-red spice-scented usually double flowers; widely cultivated in many varieties and many colors
 
Dianthus chinensis
Chinese pink with deeply toothed rose-lilac flowers with a purplish eye; usually raised as an annual
 
Dianthus chinensis heddewigii
a flowering variety of China pink distinguished by jagged-edged petals
 
Dianthus deltoides
low-growing loosely mat-forming Eurasian pink with a single pale pink flower with a crimson center
 
Dianthus latifolius
much-branched pink with flowers in clusters; closely related to sweet William
 
Dianthus plumarius
European pink cultivated for its very fragrant pink or rosy flowers
 
Dianthus supurbus
Eurasian perennial pink having fragrant lilac or rose flowers with deeply fringed margins
 
diapensia
any boreal low-growing evergreen plant of the genus Diapensia
 
Dicentra canadensis
American plant with cream-colored flowers and tuberous roots resembling kernels of corn
 
Dicentra spectabilis
garden plant having deep-pink drooping heart-shaped flowers
 
Dichondra micrantha
a creeping perennial herb with hairy stems and orbicular to reniform leaves and small white to greenish flowers; used as a grass substitute in warm regions
 
Dicksonia antarctica
of Australia and Tasmania; often cultivated; hardy in cool climates
 
dicot family
family of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination
 
dicot genus
genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination
 
dicot
flowering plant with two cotyledons; the stem grows by deposit on its outside
 
Dictamnus alba
Eurasian perennial herb with white flowers that emit flammable vapor in hot weather
 
dictostylium
any slime mold of the genus Dictostylium
 
Dieffenbachia sequine
an evergreen plant with large showy dark green leaves; contains a poison that swells the tongue and throat hence the name
 
Diervilla lonicera
spreading bush of northeastern United States having small clusters of fragrant green and yellow flowers
 
Diervilla sessilifolia
bush honeysuckle of southeastern United States having large crowded clusters of sulfur-yellow flowers
 
Digitalis lutea
European yellow-flowered foxglove
 
Digitalis purpurea
tall leafy European biennial or perennial having spectacular clusters of large tubular pink-purple flowers; leaves yield drug digitalis and are poisonous to livestock
 
digitalis
any of several plants of the genus Digitalis
 
Digitaria ischaemum
a weed
 
Digitaria sanguinalis
a European forage grass grown for hay; a naturalized weed in United States
 
dillenia
any of several evergreen trees or shrubs of the genus Dillenia grown for their foliage and nodding flowers resembling magnolias which are followed by fruit that is used in curries and jellies and preserves
 
dilleniid dicot family
family of more or less advanced dicotyledonous trees and shrubs and herbs
 
dilleniid dicot genus
genus of more or less advanced dicotyledonous trees and shrubs and herbs
 
Dimocarpus longan
tree of southeastern Asia to Australia grown primarily for its sweet edible fruit resembling litchi nuts; sometimes placed in genera Euphorbia or Nephelium
 
Dionaea muscipula
carnivorous plant of coastal plains of the Carolinas having sensitive hinged marginally bristled leaf blades that close and entrap insects
 
dioon
any cycad of the genus Dioon; handsome palmlike cycads with robust crowns of leaves and rugged trunks
 
Dioscorea alata
grown in Australasia and Polynesia for its large root with fine edible white flesh
 
Dioscorea batata
hardy Chinese vine naturalized in United States and cultivated as an ornamental climber for its glossy heart-shaped cinnamon-scented leaves and in the tropics for its edible tubers
 
Dioscorea bulbifera
yam of tropical Africa and Asia cultivated for it large tubers
 
Dioscorea elephantipes
South African vine having a massive rootstock covered with deeply fissured bark
 
Dioscorea paniculata
having a rhizome formerly dried and used to treat rheumatism or liver disorders
 
Dioscorea trifida
tropical American yam with small yellow edible tubers
 
Diospyros ebenum
tropical tree of southern Asia having hard dark-colored heartwood used in cabinetwork
 
Diospyros kurzii
large Asiatic tree having hard marbled zebrawood
 
Diospyros lotus
an Asiatic persimmon tree cultivated for its small yellow or purplish-black edible fruit much valued by Afghan tribes
 
Diospyros virginiana
medium-sized tree of dry woodlands in the southern and eastern United States bearing yellow or orange very astringent fruit that is edible when fully ripe
 
Diplazium pycnocarpon
North American fern with narrow fronds on yellowish leafstalks
 
Diplopterygium longissimum
large scrambling fern forming large patches to 18 feet high; Pacific region and China
 
Diplotaxis erucoides
from Mediterranean region; a naturalized weed throughout southern Europe
 
Diplotaxis tenuifolia
yellow-flowered European plant that grows on old walls and in waste places; an adventive weed in North America
 
Dipsacus fullonum
teasel with lilac flowers native to Old World but naturalized in North America; dried flower heads used to raise a nap on woolen cloth
 
Dipsacus sativus
similar to the common teasel and similarly used; widespread in Europe and North Africa and western Asia; naturalized in United States
 
Dipsacus sylvestris
European teasel with white to pink flowers; naturalized in United States
 
dipterocarp
tree of the family Dipterocarpaceae
 
Dirca palustris
deciduous shrub of eastern North America having tough flexible branches and pliable bark and small yellow flowers
 
disa
any orchid of the genus Disa; beautiful orchids with dark green leaves and usually hooded flowers; much prized as emblematic flowers in their native regions
 
discina
any fungus of the genus Discina
 
Discina macrospora
a discina with a flat or saucer-shaped fertile body that is brown on the upper surface; has a short stalk; not recommended for eating
 
Disciotis venosa
an edible morel with a cup-shaped or saucer-shaped fruiting body can be up to 20 cm wide; the fertile surface inside the cup has wrinkles radiating from the center; can be easily confused with inedible mushrooms
 
dishcloth gourd
any of several tropical annual climbers having large yellow flowers and edible young fruits; grown commercially for the mature fruit's dried fibrous interior that is used as a sponge
 
divi-divi
twisted seed pods of the divi-divi tree; source of tannin
 
division Bryophyta
a division of nonflowering plants characterized by rhizoids rather than true roots and having little or no organized vascular tissue and showing alternation of generations between gamete-bearing forms and spore-bearing forms; comprises true mosses (Bryopsida) and liverworts (Hepaticopsida) and hornworts (Anthoceropsida)
 
division Eumycota
true fungi; eukaryotic heterotrophic walled organisms; distinguished from Myxomycota (funguslike slime molds): comprises subdivisions Mastigomycotina; Zygomycotina; Ascomycotina; Basidiomycotina; Deuteromycotina (imperfect fungi)
 
division Gymnomycota
slime molds; organisms having a noncellular and multinucleate creeping vegetative phase and a propagative spore-producing stage: comprises Myxomycetes and Acrasiomycetes; in some classifications placed in the kingdom Protoctista
 
division Gymnospermophyta
plants having naked seeds not enclosed in an ovary; in some systems considered a class (Gymnospermae) and in others a division (Gymnospermophyta); comprises three subdivisions (or classes): Cycadophytina (class Cycadopsida) and Gnetophytina (class Gnetopsida) and Coniferophytina (class Coniferopsida); in some classifications the Coniferophytina are divided into three groups: Pinophytina (class Pinopsida) and Ginkgophytina (class Ginkgopsida) and Taxophytina (class Taxopsida)
 
division Lichenes
comprising the lichens which grow symbiotically with algae; sometimes treated as an independent group more or less coordinate with algae and fungi
 
division Magnoliophyta
comprising flowering plants that produce seeds enclosed in an ovary; in some systems considered a class (Angiospermae) and in others a division (Magnoliophyta or Anthophyta)
 
division Pteridophyta
containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns; in some classifications considered a subdivision of Tracheophyta
 
division Spermatophyta
seed plants; comprises the Angiospermae (or Magnoliophyta) and Gymnospermae (or Gymnospermophyta); in some classification systems Spermatophyta is coordinate with Pteridophyta (spore producing plants having vascular tissue and roots) and Bryophyta (spore producing plants lacking vascular tissue and roots)
 
division Tracheophyta
in former classifications: comprising plants with a vascular system including ferns and fern allies as well as seed plants
 
dock
any of certain coarse weedy plants with long taproots, sometimes used as table greens or in folk medicine
 
dodder
a leafless annual parasitic vine of the genus Cuscuta having whitish or yellow filamentous stems; obtain nourishment through haustoria
 
dog's-tooth violet
perennial woodland spring-flowering plant; widely cultivated
 
dogbane
any of several poisonous perennial plants of the genus Apocynum having acrid milky juice and bell-shaped white or pink flowers and a very bitter root
 
dogwood
hard tough wood of any dogwood of the genus Cornus; resembles boxwood
 
Dolichos lignosus
South African evergreen partly woody vine grown for its clusters of rosy purple flowers followed by edible pods like snap beans; also grown as green manure; sometimes placed in genus Dolichos
 
domatium
a part of a plant (e.g., a leaf) that has been modified to provide protection for insects or mites or fungi
 
dombeya
any of various shrubs or small trees of the genus Dombeya grown for their rounded clusters of exquisite often sweet-scented flowers usually hanging beneath the leaves
 
Dominican mahogany
mahogany tree of West Indies
 
doodia
any fern of the genus Doodia having pinnate fronds with sharply dentate pinnae
 
Dorotheanthus bellidiformis
low-growing showy succulent annual of South Africa having white or pink or red or orange flowers and spatulate leaves covered in papillae that resemble small crystals
 
Doryopteris pedata
tropical American fern with coarsely lobed to palmatifid fronds
 
douglas fir
tall evergreen timber tree of western North America having resinous wood and short needles
 
douglas fir
strong durable timber of a douglas fir
 
Dovyalis caffra
vigorous South African spiny shrub grown for its round yellow juicy edible fruits
 
Dovyalis hebecarpa
a small shrubby spiny tree cultivated for its maroon-purple fruit with sweet purple pulp tasting like gooseberries; Sri Lanka and India
 
downy mildew
any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons
 
draba
any of numerous low-growing cushion-forming plants of the genus Draba having rosette-forming leaves and terminal racemes of small flowers with scapose or leafy stems; fruit is a dehiscent oblong or linear silique
 
Draba verna
annual weed of Europe and North America having a rosette of basal leaves and tiny flowers followed by oblong seed capsules
 
dracaena
an agave that is often cultivated for its decorative foliage
 
Dracaena draco
tall tree of the Canary Islands; source of dragon's blood
 
Dracocephalum parviflorum
American herb having sharply serrate lanceolate leaves and spikes of blue to violet flowers
 
dracontium
any plant of the genus Dracontium; strongly malodorous tropical American plants usually with gigantic leaves
 
Dracunculus vulgaris
European arum resembling the cuckoopint
 
Drimys winteri
South American evergreen tree yielding winter's bark and a light soft wood similar to basswood
 
dropseed
a grass of the genus Sporobolus
 
Drosophyllum lusitanicum
perennial of dry habitats whose leaves have glandular hairs that secrete adhesive and digestive fluid for capture and digestion of insects; Portugal, southern Spain and Morocco
 
drupe
fleshy indehiscent fruit with a single seed: e.g. almond; peach; plum; cherry; elderberry; olive; jujube
 
drupelet
a small part of an aggregate fruit that resembles a drupe
 
dry rot
a fungus causing dry rot
 
Dryas octopetala
creeping evergreen shrub with large white flowers; widely distributed in northern portions of Eurasia and North America
 
Drynaria rigidula
giant epiphytic or lithophytic fern; Asia to Polynesia and Australia
 
Dryopteris dilatata
European shield fern
 
Dryopteris filix-mas
fern of North America and Europe whose rhizomes and stalks yield an oleoresin used to expel tapeworms
 
Dryopteris fragrans
fern or northern Eurasia and North America having fragrant fronds
 
Dryopteris marginalis
North American fern with evergreen fronds
 
Dryopteris oreades
a fern of the genus Dryopteris
 
Dryopteris thelypteris
fern having pinnatifid fronds and growing in wet places; cosmopolitan in north temperate regions
 
Dryopteris thelypteris pubescens
fern of northeastern North America
 
drypis
spiny-leaved perennial herb of southern Europe having terminal clusters of small flowers
 
duckweed
any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds
 
duct
a continuous tube formed by a row of elongated cells lacking intervening end walls
 
Duke of Argyll's tea tree
deciduous erect or spreading shrub with spiny branches and violet-purple flowers followed by orange-red berries; southeastern Europe to China
 
duramen
the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood
 
Durio zibethinus
tree of southeastern Asia having edible oval fruit with a hard spiny rind
 
Dutch case-knife bean
tropical American bean with red flowers and mottled black beans similar to Phaseolus vulgaris but perennial; a preferred food bean in Great Britain
 
Dutchman's breeches
delicate spring-flowering plant of the eastern United States having white flowers with double spurs
 
dwarf Russian almond
Asiatic shrub cultivated for its rosy red flowers
 
dwarf-white trillium
a low perennial white-flowered trillium found in the southeastern United States
 
earth-ball
any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe
 
earthball
any of various fungi of the genus Scleroderma having hard-skinned subterranean fruiting bodies resembling truffles
 
earthstar
any fungus of the family Geastraceae; in form suggesting a puffball whose outer peridium splits into the shape of a star
 
earthtongue
any club-shaped fungus of the genus Geoglossum
 
east African cedar
tropical African timber tree with fragrant wood
 
East India kino
reddish or black juice or resin from certain trees of the genus Pterocarpus and used in medicine and tanning etc
 
East Indian fig tree
East Indian tree that puts out aerial shoots that grow down into the soil forming additional trunks
 
East Indian rosewood
East Indian tree having a useful dark purple wood
 
Eastern cottonwood
a common poplar of eastern and central United States; cultivated in United States for its rapid growth and luxuriant foliage and in Europe for timber
 
Eastern hop hornbeam
medium-sized hop hornbeam of eastern North America
 
Eastern silvery aster
a variety of aster
 
ebony
hard dark-colored heartwood of the ebony tree; used in cabinetwork and for piano keys
 
Eburophyton austinae
waxy white nearly leafless plant with stems in clusters and racemes of white flowers; northwestern United States to northern California and east to Idaho
 
Ecballium elaterium
Mediterranean vine having oblong fruit that when ripe expels its seeds and juice violently when touched
 
Echinocactus grusonii
large cactus of east central Mexico having golden to pale yellow flowers and spines
 
Echinochloa crusgalli
a coarse annual panic grass; a cosmopolitan weed; occasionally used for hay or grazing
 
Echium vulgare
a coarse prickly European weed with spikes of blue flowers; naturalized in United States
 
Egyptian corn
sorghums of dry regions of Asia and North Africa
 
Egyptian cotton
fine somewhat brownish long-staple cotton grown in Egypt; believed to be derived from sea island cotton or by hybridization with Peruvian cotton
 
Egyptian lupine
white-flowered Eurasian herb widely cultivated for forage and erosion control
 
Egyptian paper reed
tall sedge of the Nile valley yielding fiber that served many purposes in historic times
 
Egyptian water lily
white Egyptian lotus: water lily of Egypt to southeastern Africa; held sacred by the Egyptians
 
Eichhornia crassipes
a tropical floating aquatic plant having spikes of large blue flowers; troublesome in clogging waterways especially in southern United States
 
Elaeagnus augustifolia
deciduous shrubby tree of Europe and western Asia having grey leaves and small yellow fruits covered in silvery scales; sometimes spiny
 
Elaeagnus commutata
deciduous unarmed North American shrub with silvery leaves and fruits
 
Elaeagnus latifolia
erect shrub or climber of India and China with red olivelike fruit
 
Elaeis guineensis
oil palm of Africa
 
Elaeocarpus grandis
Australian tree having hard white timber and glossy green leaves with white flowers followed by one-seeded glossy blue fruit
 
elder
any of numerous shrubs or small trees of temperate and subtropical northern hemisphere having white flowers and berrylike fruit
 
elemi
fragrant resin obtain from trees of the family Burseraceae and used as incense
 
Eleocharis acicularis
fine-leaved aquatic spike rush; popular as aerator for aquariums
 
Eleocharis palustris
cylindrical-stemmed sedge
 
elephant's-foot
any plant of the genus Elephantopus having heads of blue or purple flowers; America
 
Elettaria cardamomum
rhizomatous herb of India having aromatic seeds used as seasoning
 
Eleusine coracana
East Indian cereal grass whose seed yield a somewhat bitter flour, a staple in the Orient
 
Eleusine indica
coarse annual grass having fingerlike spikes of flowers; native to Old World tropics; a naturalized weed elsewhere
 
elf cup
apothecium of a fungus of the family Pezizaceae
 
Elliott's goldenrod
a variety of goldenrod
 
elliptic leaf
a simple leaf shaped like an ellipse
 
elm
any of various trees of the genus Ulmus: important timber or shade trees
 
elm
hard tough wood of an elm tree; used for e.g. implements and furniture
 
Elodea canadensis
North American waterweed; widely naturalized in Europe
 
Elodea densa
aquatic plant with deep green foliage useful to oxygenate an aquarium; sometimes placed in genus Egeria
 
elongate leaf
a long slender leaf
 
elsholtzia
any of various aromatic herbs of the genus Elsholtzia having blue or purple flowers in one-sided spikes
 
Elymus canadensis
North American wild rye
 
Elymus caput-medusae
weedy rye grass having long bristling awns
 
emarginate leaf
a leaf having a notch at the apex
 
Embothrium coccineum
grown for outstanding display of brilliant usually scarlet-crimson flowers; Andes
 
embryo
(botany) a minute rudimentary plant contained within a seed or an archegonium
 
Emilia sagitta
tropical Asiatic annual cultivated for its small tassel-shaped heads of scarlet flowers
 
enation
a natural projection or outgrowth from a plant body or organ
 
Encelia farinosa
fragrant rounded shrub of southwestern United States and adjacent Mexico having brittle stems and small crowded blue-green leaves and yellow flowers; produces a resin used in incense and varnish and in folk medicine
 
Enceliopsis nudicaulis
herb having a basal cluster of grey-green leaves and leafless stalks each with a solitary broad yellow flower head; desert areas Idaho to Arizona
 
encephalartos
any of numerous cycads of the genus Encephalartos having stout cylindrical trunks and a terminal crown of long often spiny pinnate leaves
 
Encephalartos caffer
South African cycad; the farinaceous pith of the fruit used as food
 
enchanter's nightshade
any of several erect perennial rhizomatous herbs of the genus Circaea having white flowers that open at dawn; northern hemisphere
 
Encyclia citrina
Mexican epiphytic orchid with glaucous grey-green leaves and lemon- to golden-yellow flowers appearing only partially opened; sometimes placed in genus Cattleya
 
endemic
a plant that is native to a certain limited area
 
endocarp
the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed
 
endogen
a monocotyledonous flowering plant; the stem grows by deposits on its inside
 
endosperm
nutritive tissue surrounding the embryo within seeds of flowering plants
 
endospore
a small asexual spore that develops inside the cell of some bacteria and algae
 
Engelmann's spruce
tall spruce of Rocky Mountains and British Columbia with blue-green needles and acutely conic crown; wood used for rough lumber and boxes
 
engelmannia
common erect hairy perennial of plains and prairies of southern and central United States having flowers that resemble sunflowers
 
English ryegrass
European perennial grass widely cultivated for pasture and hay and as a lawn grass
 
English violet
European violet typically having purple to white flowers; widely naturalized
 
English walnut tree
Eurasian walnut valued for its large edible nut and its hard richly figured wood; widely cultivated
 
Ensete ventricosum
large evergreen arborescent herb having huge paddle-shaped leaves and bearing inedible fruit that resemble bananas but edible young flower shoots; sometimes placed in genus Musa
 
ensiform leaf
a sword-shaped leaf; as of iris
 
Entandrophragma cylindricum
African tree having rather lightweight cedar-scented wood varying in color from pink to reddish brown
 
Enterolobium cyclocarpa
tropical South American tree having a wide-spreading crown of bipinnate leaves and coiled ear-shaped fruits; grown for shade and ornament as well as valuable timber
 
entire leaf
a leaf having a smooth margin without notches or indentations
 
Entoloma aprile
an agaric with a dark brown conical cap; fruits in early spring
 
Entoloma sinuatum
a deadly poisonous agaric; a large cap that is first white (livid or lead-colored) and then turns yellowish or tan
 
epacris
any heathlike evergreen shrub of the genus Epacris grown for their showy and crowded spikes of small bell-shaped or tubular flowers
 
Epacris impressa
spindly upright shrub of southern Australia and Tasmania having white to rose or purple-red flowers
 
Epacris obtusifolia
small erect shrub of Australia and Tasmania with fragrant ivory flowers
 
Epacris purpurascens
small shrub of southern and western Australia having pinkish to rosy purple tubular flowers
 
Ephedra sinica
Chinese ephedra yielding ephedrine
 
ephedra
jointed and nearly leafless desert shrub having reduced scalelike leaves and reddish fleshy seeds
 
epicarp
outermost layer of the pericarp of fruits as the skin of a peach or grape
 
epidendron
any of various orchids of the genus Epidendrum
 
Epidendrum tampense
orchid of Florida and the Bahamas having showy brightly colored flowers; sometimes placed in genus Epidendrum
 
Epidendrum venosum
Mexican epiphytic orchid having pale green or yellow-green flowers with white purple-veined lip
 
Epigaea repens
low-growing evergreen shrub of eastern North America with leathery leaves and clusters of fragrant pink or white flowers
 
Epilobium angustifolium
tall North American perennial with creeping rootstocks and narrow leaves and spikes of pinkish-purple flowers occurring in great abundance in burned-over areas or recent clearings; an important honey plant
 
Epilobium hirsutum
plant of Europe and Asia having purplish-red flowers and hairy stems and leaves; introduced into North America
 
Epimedium grandiflorum
slow-growing creeping plant with semi-evergreen leaves on erect wiry stems; used as ground cover
 
Epipactis gigantea
orchid growing along streams or ponds of western North America having leafy stems and 1 greenish-brown and pinkish flower in the axil of each upper leaf
 
Epipactis helleborine
European orchid with spikes of green and pinkish or purplish flowers
 
epiphyllum
any cactus of the genus Epiphyllum having flattened jointed irregularly branching stems and showy tubular flowers
 
episcia
any plant of the genus Episcia; usually creeping and stoloniferous and of cascading habit; grown for their colorful foliage and flowers
 
Episcia dianthiflora
low-growing creeping perennial of Central America having deeply fringed white flowers; sometimes placed in genus Episcia
 
episperm
protective outer layer of seeds of flowering plants
 
Equisetum arvense
of Eurasia and Greenland and North America
 
Equisetum fluviatile
Eurasia; northern North America to Virginia
 
Equisetum hyemale robustum
evergreen erect horsetail with rough-edged stems; formerly used for scouring utensils
 
Equisetum palustre
scouring-rush horsetail widely distributed in wet or boggy areas of northern hemisphere
 
Equisetum Sylvaticum
Eurasia except southern Russia; northern North America
 
Equisetum variegatum
northern North America; Greenland; northern and central Europe
 
Eragrostic abyssinica
an African grass economically important as a cereal grass (yielding white flour of good quality) as well as for forage and hay
 
Eragrostis curvula
perennial South African grass having densely clumped flimsy stems; introduced into United States especially for erosion control
 
Eranthis hyemalis
small Old World perennial herb grown for its bright yellow flowers which appear in early spring often before snow is gone
 
Erechtites hieracifolia
an American weedy plant with small white or greenish flowers
 
Erianthus ravennae
grass often cultivated for its long white-ribbed leaves and large plumes resembling those of pampas grass
 
Erica arborea
evergreen treelike Mediterranean shrub having fragrant white flowers in large terminal panicles and hard woody roots used to make tobacco pipes
 
Erica carnea
dwarf European shrub with very early blooming bell-shaped red flowers
 
Erica cinerea
common low European shrub with purple-red flowers
 
Erica tetralix
dwarf European shrub with rose-colored flowers
 
erica
any plant of the genus Erica
 
Erigeron acer
widespread weed with pale purple-blue flowers
 
Erigeron annuus
widely naturalized white-flowered North American herb
 
Erigeron aurantiacus
mat-forming herb of Turkestan with nearly double orange-yellow flowers
 
Erigeron canadensis
common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron
 
Erigeron divergens
well-branched plant with hairy leaves and stems each with a solitary flower head with narrow white or pink or lavender rays; western North America
 
Erigeron glaucous
slightly succulent perennial with basal leaves and hairy sticky stems each bearing a solitary flower head with narrow pink or lavender rays; coastal bluffs Oregon to southern California
 
Erigeron philadelphicus
especially pretty plant having a delicate fringe of threadlike rays around flower heads having very slender white or pink rays; United States and Canada
 
Erigeron pulchellus
common perennial of eastern North America having flowers with usually violet-purple rays
 
Erigeron speciosus
plant having branching leafy stems each branch with an especially showy solitary flower head with many narrow pink or lavender or white rays; northwestern United States mountains
 
Erigonum fasciculatum
low-growing shrub with spreading branches and flowers in loose heads; desert regions of western United States (California to Utah)
 
eringo
any plant of the genus Eryngium
 
Eriobotrya japonica
evergreen tree of warm regions having fuzzy yellow olive-sized fruit with a large free stone; native to China and Japan
 
Eriocaulon aquaticum
aquatic perennial of North America and Ireland and Hebrides having translucent green leaves in a basal spiral and dense buttonlike racemes of minute white flowers
 
Eriodictyon californicum
viscid evergreen shrub of western United States with white to deep lilac flowers; the sticky aromatic leaves are used in treating bronchial and pulmonary illnesses
 
eriogonum
any plant of the genus Eriogonum with small clustered flowers
 
Eriogonum allenii
late blooming perennial plant of shale barrens of Virginia having flowers in flat-topped clusters
 
Eriophorum angustifolium
having densely tufted white cottony or downlike glumes
 
Eriophyllum lanatum
greyish woolly leafy perennial with branched stems ending in leafless stalks bearing golden-yellow flower heads; dry areas western North America
 
Eriophyllum wallacei
tiny grey woolly tufted annual with small golden-yellow flower heads; southeastern California to northwestern Arizona and southwestern Utah; sometimes placed in genus Eriophyllum
 
Erodium cicutarium
European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage
 
Erodium moschatum
low annual European herb naturalized in America; similar to alfilaria
 
erose leaf
a leaf having a jagged margin as though gnawed
 
Eruca vesicaria sativa
erect European annual often grown as a salad crop to be harvested when young and tender
 
Eryngium aquaticum
coarse prickly perennial eryngo with aromatic roots; southeastern United States; often confused with rattlesnake master
 
Eryngium maritimum
European evergreen eryngo with twisted spiny leaves naturalized on United States east coast; roots formerly used as an aphrodisiac
 
Eryngium yuccifolium
coarse prickly perennial eryngo of United States thought to cure rattlesnake bite
 
Erysimum arkansanum
biennial or short-lived perennial prairie rocket having orange-yellow flowers; western North America to Minnesota and Kansas; sometimes placed in genus Cheiranthus
 
Erysimum cheiranthoides
slender yellow-flowered European mustard often troublesome as a weed; formerly used as an anthelmintic
 
Erythrina caffra
small semi-evergreen broad-spreading tree of eastern South Africa with orange-scarlet flowers and small coral-red seeds; yields a light soft wood used for fence posts or shingles
 
Erythrina corallodendrum
deciduous shrub having racemes of deep red flowers and black-spotted red seeds
 
Erythrina crista-galli
small South American spiny tree with dark crimson and scarlet flowers solitary or clustered
 
Erythrina variegata
small to medium-sized thorny tree of tropical Asia and northern Australia having dense clusters of scarlet or crimson flowers and black seeds
 
Erythrina vespertilio
prickly Australian coral tree having soft spongy wood
 
Erythronium albidum
North American dogtooth having solitary white flowers with yellow centers and blue or pink exteriors
 
Erythronium americanum
eastern North American dogtooth having solitary yellow flowers marked with brown or purple and spotted interiors
 
Erythronium californicum
California dogtooth violet with creamy white flowers sometimes yellow-tinged
 
Erythronium dens-canis
sturdy European dogtooth with rose to mauve flowers; cultivated in many varieties
 
Erythronium grandiflorum
dogtooth violet of western North America having bright yellow flowers
 
Erythronium montanum
perennial herb having large white flowers marked with orange; found near the snow line in the northwestern United States
 
Erythroxylon coca
a South American shrub whose leaves are chewed by natives of the Andes; a source of cocaine
 
Erythroxylon truxiuense
a South American shrub whose leaves are a source of cocaine
 
escape
a plant originally cultivated but now growing wild
 
Eschscholtzia californica
of Pacific coast of North America; widely cultivated for its yellow to red flowers
 
Eucalypt grandis
very tall tree of Queensland and New South Wales
 
Eucalypt gunnii
small to medium-sized tree of Tasmania
 
Eucalypt ovata
medium-sized tree of southern Australia
 
Eucalypt tereticornis
tall tree of Queensland and New South Wales and Victoria
 
eucalypt
a tree of the genus Eucalyptus
 
eucalyptus
wood of any of various eucalyptus trees valued as timber
 
Eucalyptus amygdalina
red gum tree of Tasmania
 
Eucalyptus calophylla
very large red gum tree
 
Eucalyptus camaldulensis
somewhat crooked red gum tree growing chiefly along rivers; has durable reddish lumber used in heavy construction
 
Eucalyptus camphora
medium-sized swamp gum of New South Wales and Victoria
 
Eucalyptus delegatensis
tall timber tree with hard heavy pinkish or light brown wood
 
Eucalyptus dumosa
small shrubby mallee
 
Eucalyptus fraxinoides
large tree with dark compact bark on lower trunk but smooth and white above; yields lumber similar to that of European or American ashes
 
Eucalyptus globulus
tall fast-growing timber tree with leaves containing a medicinal oil; young leaves are bluish
 
eucalyptus gum
reddish-brown dried gummy exudation from any of several trees of the genus Eucalyptus especially Eucalyptus camaldulensis
 
Eucalyptus maculata
large gum tree with mottled bark
 
Eucalyptus maculata citriodora
similar to but smaller than the spotted gum and having lemon-scented leaves
 
Eucalyptus pauciflora
small to medium-sized tree of Australia and Tasmania having smooth white to light-grey bark shedding in patches or strips
 
Eucalyptus regnans
tree having wood similar to the alpine ash; tallest tree in Australia and tallest hardwood in the world
 
Eucalyptus viminalis
tall tree yielding a false manna
 
Eucalyptusd eugenioides
stringybark having white wood
 
Eucalytus stellulata
a small mallee with rough dark-colored bark toward the butt; yields a red eucalyptus kino gum
 
Eugenia caryophyllatum
moderate sized very symmetrical red-flowered evergreen widely cultivated in the tropics for its flower buds which are source of cloves
 
Eugenia corynantha
Australian tree with sour red fruit
 
Eugenia dicrana
tree of extreme southern Florida and West Indies having thin scaly bark and aromatic fruits and seeds and yielding hard heavy close-grained zebrawood
 
Eugenia jambos
tropical tree of the East Indies cultivated for its edible fruit
 
Eugenia uniflora
Brazilian tree with spicy red fruit; often cultivated in California and Florida
 
Euonymous alatus
bushy deciduous shrub with branches having thin wide corky longitudinal wings; brilliant red in autumn; northeastern Asia to central China
 
Euonymus americanus
upright deciduous plant with crimson pods and seeds; the eastern United States from New York to Florida and Texas
 
Euonymus atropurpureus
deciduous shrub having purple capsules enclosing scarlet seeds
 
Euonymus europaeus
small erect deciduous shrub having tough white wood and cathartic bark and fruit
 
Euonymus fortunei radicans
broad and bushy Asiatic twining shrub with pinkish fruit; many subspecies or varieties
 
Eupatorium cannabinum
coarse European herb with palmately divided leaves and clusters of small reddish-purple flower heads
 
Eupatorium capillifolium
weedy plant of southeastern United States having divided leaves and long clusters of greenish flowers
 
Eupatorium maculatum
North American herb having whorled leaves and terminal clusters of small pinkish or purple flower heads
 
Eupatorium perfoliatum
perennial herb of southeastern United States having white-rayed flower heads; formerly used as in folk medicine
 
Eupatorium purpureum
North American herb having whorled leaves and terminal clusters of flowers spotted with purple
 
Euphorbia amygdaloides
European perennial herb with greenish yellow terminal flower clusters
 
Euphorbia antisyphilitica
wax-coated shrub of northern Mexico and southwestern United States
 
Euphorbia caput-medusae
African dwarf succulent perennial shrub with numerous slender drooping branches
 
Euphorbia corollata
common perennial United States spurge having showy white petallike bracts
 
Euphorbia cyathophora
poinsettia of United States and eastern Mexico; often confused with Euphorbia heterophylla
 
Euphorbia cyparissias
Old World perennial having foliage resembling cypress; naturalized as a weed in the United States
 
Euphorbia dentata
an annual weed of northeastern North America with dentate leaves
 
Euphorbia esula
tall European perennial naturalized and troublesome as a weed in eastern North America
 
Euphorbia exigua
European erect or depressed annual weedy spurge adventive in northeastern United States
 
Euphorbia fulgens
Mexican shrub often cultivated for its scarlet-bracted flowers
 
Euphorbia helioscopia
not unattractive European weed whose flowers turn toward the sun
 
Euphorbia heterophylla
showy poinsettia found from the southern United States to Peru
 
Euphorbia hirsuta
much-branched hirsute weed native to northeastern North America
 
Euphorbia ingens
small tree of dry open parts of southern Africa having erect angled branches suggesting candelabra
 
Euphorbia lathyris
poisonous Old World spurge; adventive in America; seeds yield a purgative oil
 
Euphorbia marginata
annual spurge of western United States having showy white-bracted flower clusters and very poisonous milk
 
Euphorbia milii
somewhat climbing bushy spurge of Madagascar having long woody spiny stems with few leaves and flowers with scarlet bracts
 
Euphorbia peplus
an Old World spurge introduced as a weed in the eastern United States
 
Euphorbia pulcherrima
tropical American plant having poisonous milk and showy tapering usually scarlet petallike leaves surrounding small yellow flowers
 
European barberry
upright deciduous European shrub widely naturalized in United States having clusters of juicy berries
 
European bean
Old World upright plant grown especially for its large flat edible seeds but also as fodder
 
European beggar-ticks
bur marigold of temperate Eurasia
 
European bird cherry
small European cherry tree closely resembling the American chokecherry
 
European black alder
medium-sized tree with brown-black bark and woody fruiting catkins; leaves are hairy beneath
 
European black currant
widely cultivated current bearing edible black aromatic berries
 
European chestnut
wild or cultivated throughout southern Europe, northwestern Africa and southwestern Asia
 
European cranberry bush
deciduous thicket-forming Old World shrub with clusters of white flowers and small bright red berries
 
European dewberry
creeping European bramble bearing dewberries
 
European dune grass
a dune grass of the Pacific seacoast used as a sand binder
 
European fly honeysuckle
cultivated Eurasian shrub with twin yellowish-white flowers and scarlet fruit
 
European hornbeam
medium-sized Old World tree with smooth grey bark and leaves like beech that turn yellow-orange in autumn
 
European ladies' tresses
European orchid having shorter racemes of strongly spiraling snow-white flowers
 
European larch
tall European tree having a slender conic crown, flat needlelike leaves, and hairy cone scales
 
European mountain ash
Eurasian tree with orange-red berrylike fruits
 
European nut pine
medium-sized two-needled pine of southern Europe having a spreading crown; widely cultivated for its sweet seeds that resemble almonds
 
European olive tree
evergreen tree cultivated in the Mediterranean region since antiquity and now elsewhere; has edible shiny black fruits
 
European parsley fern
fern of Europe and Asia Minor having short slender rhizome and densely tufted bright green fronds resembling parsley
 
European pasqueflower
European perennial having usually violet or white spring flowers
 
European quaking aspen
Old World aspen with a broad much-branched crown; northwestern Europe and Siberia to North Africa
 
European raspberry
the common European raspberry; fruit red or orange
 
European red elder
Eurasian shrub
 
European silver fir
tall timber tree of central and southern Europe having a regular crown and grey bark
 
European turkey oak
large deciduous tree of central and southern Europe and Asia Minor having lanceolate leaves with spiked lobes
 
European white birch
European birch with silvery white peeling bark and markedly drooping branches
 
European white lily
a water lily with white flowers
 
European woolly thistle
woolly thistle of western and central Europe and Balkan Peninsula
 
eusporangium
a sporangium that arises from a group of epidermal cells
 
Eustoma grandiflorum
one of the most handsome prairie wildflowers having large erect bell-shaped bluish flowers; of moist places in prairies and fields from eastern Colorado and Nebraska south to New Mexico and Texas
 
Euterpe oleracea
Brazilian palm of genus Euterpe whose leaf buds are eaten like cabbage when young
 
evening primrose
any of several plants of the family Onagraceae
 
evergreen beech
any of various beeches of the southern hemisphere having small usually evergreen leaves
 
evergreen
a plant having foliage that persists and remains green throughout the year
 
everlasting pea
any of several perennial vines of the genus Lathyrus
 
everlasting
any of various plants of various genera of the family Compositae having flowers that can be dried without loss of form or color
 
Fabiana imbricata
Peruvian shrub with small pink to lavender tubular flowers; leaves yield a tonic and diuretic
 
Fagopyrum esculentum
a member of the genus Fagopyrum; annual Asian plant with clusters of small pinkish white flowers and small edible triangular seeds which are used whole or ground into flour
 
Fagus grandifolia
North American forest tree with light green leaves and edible nuts
 
Fagus sylvatica
large European beech with minutely-toothed leaves; widely planted as an ornamental in North America
 
Fagus sylvatica atropunicea
variety of European beech with shining purple or copper-colored leaves
 
Fagus sylvatica pendula
variety of European beech with pendulous limbs
 
fair-maids-of-France
rosette-forming perennial having compact panicles of white flowers; Europe
 
fairy circle
a ring of fungi marking the periphery of the perennial underground growth of the mycelium
 
fairy lantern
any of several plants of the genus Calochortus having egg-shaped flowers
 
Falcatifolium falciforme
small tropical rain forest tree of Indonesia and Malaysia
 
Falcatifolium taxoides
a rain forest tree or shrub of New Caledonia having a conic crown and pale green sickle-shaped leaves; host species for the rare parasite yew
 
falls
the petals or sepals of a flower that bend downward (especially the outer perianth of an iris)
 
false asphodel
a plant of the genus Tofieldia having linear chiefly basal leaves and small spicate flowers
 
false chamomile
any of various autumn-flowering perennials having white or pink to purple flowers that resemble asters; wild in moist soils from New Jersey to Florida and Texas
 
false fruit
a fleshy fruit (apple or pear or related fruits) having seed chambers and an outer fleshy part
 
false gromwell
any of several North American perennial herbs with hairy foliage and small yellowish or greenish flowers
 
false hellebore
perennial herbs of the lily family having thick toxic rhizomes
 
false indigo
any of several plants of the genus Baptisia
 
false mallow
an American plant of the genus Malvastrum
 
false mallow
genus of coarse herbs and subshrubs of arid North and South America having pink or scarlet flowers and globose fruits
 
false mistletoe
American plants closely resembling Old World mistletoe
 
false morel
a fungus of the family Helvellaceae
 
false truffle
any of various fungi of the family Rhizopogonaceae having subterranean fruiting bodies similar to the truffle
 
family Acanthaceae
widely distributed herbs and shrubs and trees; sometimes placed in the order Scrophulariales
 
family Aceraceae
a family of trees and shrubs of order Sapindales including the maples
 
family Actinidiaceae
tropical trees or shrubs or woody vines
 
family Adiantaceae
used in some classification systems for some genera of the family Polypodiaceae (or Pteridaceae)
 
family Agaricaceae
large family including many familiar mushrooms
 
family Agavaceae
chiefly tropical and xerophytic plants: includes Dracenaceae (Dracaenaceae); comprises plants that in some classifications are divided between the Amaryllidaceae and the Liliaceae
 
family Albuginaceae
fungi that produce white sori resembling blisters on certain flowering plants
 
family Alismataceae
perennial or annual aquatic or marsh plants
 
family Alliaceae
one of many families or subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted; includes especially genus Allium
 
family Aloeaceae
one of many families or subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted
 
family Alstroemeriaceae
one of many families or subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted; sometimes included in subfamily Amaryllidaceae
 
family Amaranthaceae
cosmopolitan family of herbs and shrubs
 
family Amaryllidaceae
snowdrop; narcissus; daffodil; in some classification systems considered a subfamily of the Liliaceae
 
family Ambrosiaceae
in some classifications considered a separate family comprising a subgroup of the Compositae including the ragweeds
 
family Amygdalaceae
used in former classifications for plum and peach and almond trees which are now usually classified as members of the genus Prunus
 
family Anacardiaceae
the cashew family; trees and shrubs and vines having resinous (sometimes poisonous) juice; includes cashew and mango and pistachio and poison ivy and sumac
 
family Annonaceae
chiefly tropical trees or shrubs
 
family Anthocerotaceae
hornworts
 
family Aphyllanthaceae
one of many families or subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted; includes genus Aphyllanthes
 
family Apocynaceae
chiefly tropical trees or shrubs or herbs having milky juice and often showy flowers; many are sources of drugs
 
family Aquifoliaceae
widely distributed shrubs and trees
 
family Araceae
anthurium; calla lily; jack-in-the-pulpit; philodendron
 
family Araliaceae
mostly tropical trees and shrubs and lianas: genera Panax and Hedera
 
family Araucariaceae
tall evergreen cone-bearing trees of South America and Australia with broad leathery leaves; in some classifications included in the Pinaceae
 
family Arecaceae
chiefly tropical trees and shrubs and vines usually having a tall columnar trunk bearing a crown of very large leaves; coextensive with the order Palmales
 
family Aristolochiaceae
family of birthworts (including wild ginger)
 
family Asclepiadaceae
widely distributed family of herbs and shrubs of the order Gentianales; most with milky juice
 
family Asparagaceae
one of many families or subfamilies into which some classification systems subdivide the Liliaceae: includes genera Asparagus and sometimes Ruscus
 
family Aspergillaceae
family of fungi including some common molds
 
family Asphodelaceae
one of many subfamilies into which some classification systems subdivide the Liliaceae
 
family Aspleniaceae
one of a number of families into which Polypodiaceae has been subdivided in some classification systems; includes genera Asplenium, Pleurosorus, Schaffneria
 
family Asteraceae
plants with heads composed of many florets: aster; daisy; dandelion; goldenrod; marigold; lettuces; ragweed; sunflower; thistle; zinnia
 
family Auriculariaceae
fungi having gelatinous sporophores
 
family Avicenniaceae
used in some classifications: coextensive with the genus Avicennia
 
family Azollaceae
used in some classifications for the genus Azolla
 
family Balsaminaceae
distinguished from the family Geraniaceae by the irregular flowers
 
family Batidaceae
family coextensive with genus Batis: saltworts
 
family Begoniaceae
monoecious succulent herbs or shrubs of tropical and warm regions especially America
 
family Bennettitaceae
a family of fossil gymnospermous plants of the Carboniferous
 
family Berberidaceae
shrubs or herbs
 
family Betulaceae
monoecious trees and shrubs (including the genera Betula and Alnus and Carpinus and Corylus and Ostrya and Ostryopsis)
 
family Bignoniaceae
trees or shrubs or woody vines or herbs having fruit resembling gourds or capsules; sometimes placed in the order Scrophulariales
 
family Blastodiaceae
a family of saprobic fungi of order Blastocladiales
 
family Blechnaceae
one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems; includes genera Blechnum, Doodia, Sadleria, Stenochlaena, and Woodwardia
 
family Boletaceae
family of fleshy fungi having the germ pores easily separating from the cup and often from each other
 
family Bombacaceae
tropical trees with large dry or fleshy fruit containing usually woolly seeds
 
family Boraginaceae
a widely distributed family of plants distinguished by circinate flowers and nutlike fruit
 
family Brassicaceae
a large family of plants with four-petaled flowers; includes mustards, cabbages, broccoli, turnips, cresses, and their many relatives
 
family Bromeliaceae
a family of tropical American plants of order Xyridales including several (as the pineapple) of economic importance
 
family Bryaceae
a family of acrocarpous mosses
 
family Burmanniaceae
family of chiefly tropical herbs with basal leaves like bracts and small flowers
 
family Burseraceae
resinous or aromatic chiefly tropical shrubs or trees
 
family Buxaceae
widely distributed evergreen shrubs and trees
 
family Cactaceae
constituting the order Opuntiales
 
family Caesalpiniaceae
spiny trees, shrubs, or perennial herbs, including the genera Caesalpinia, Cassia, Ceratonia, Bauhinia; commonly included in the family Leguminosae
 
family Callitrichaceae
dicot aquatic herbs
 
family Calostomataceae
a family of fungi belonging to the order Tulostomatales
 
family Calycanthaceae
shrubs or small trees having aromatic bark; the eastern United States and eastern Asia
 
family Campanulaceae
family of plants of the order Campanulales; in some classifications includes Lobeliaceae
 
family Canellaceae
one genus: aromatic tropical trees of eastern Africa and Florida to West Indies
 
family Cannabidaceae
two genera of erect or twining herbs that are pollinated by the wind, including the genera Cannabis and Humulus; term not used in all classifications; in some the genus Cannabis is placed in the family Moraceae and the genus Humulus in the family Urticaceae
 
family Cannaceae
coextensive with the genus Canna
 
family Capparidaceae
a dilleniid dicot family of the order Rhoeadales that includes: genera Capparis, Cleome, Crateva, and Polanisia
 
family Caprifoliaceae
shrubs and small trees and woody vines
 
family Caricaceae
trees native to tropical America and Africa with milky juice and large palmately lobed leaves
 
family Caryocaraceae
small genus of tropical South American trees
 
family Caryophyllaceae
large family of herbs or subshrubs (usually with stems swollen at the nodes)
 
family Casuarinaceae
one genus: genus Casuarina
 
family Cecropiaceae
in some classifications included in family Moraceae
 
family Celastraceae
trees and shrubs and woody vines usually having bright-colored fruits
 
family Cephalotaceae
a family of plants of order Rosales; coextensive with the genus Cephalotus
 
family Cephalotaxaceae
a family of Cephalotaxaceae
 
family Ceratophyllaceae
coextensive with the genus Ceratophyllum: hornworts
 
family Ceratostomataceae
fungi having carbonous perithecia with long necks
 
family Cercidiphyllaceae
one genus
 
family Chenopodiaceae
includes spinach and beets
 
family Chloranthaceae
small family of tropical herbs and shrubs and trees
 
family Chytridiaceae
a family of aquatic fungi of order Chytridiales
 
family Cistaceae
shrubs or woody herbs of temperate regions especially Mediterranean
 
family Cladoniaceae
a family of lichens
 
family Clathraceae
family of fleshy fungi resembling stinkhorns
 
family Clavariaceae
fleshy fungi: coral fungi
 
family Clethraceae
coextensive with the genus Clethra
 
family Colchicaceae
one of many subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted: genera Colchicum and Gloriosa
 
family Combretaceae
a family of tropical trees and shrubs of the order Myrtales
 
family Commelinaceae
large widely distributed family of chiefly perennial herbs or climbers: spiderworts
 
family Connaraceae
mostly tropical climbing shrubs or small trees; closely related to Leguminosae
 
family Convallariaceae
one of many subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted
 
family Convolvulaceae
morning glory; bindweed; sweet potato; plants having trumpet-shaped flowers and a climbing or twining habit
 
family Coprinaceae
used in some classifications for the genus Coprinus
 
family Cordaitaceae
chiefly Paleozoic plants; Cordaites is the chief and typical genus
 
family Cornaceae
a rosid dicot family of the order Umbellales including: genera Aucuba, Cornus, Corokia, Curtisia, Griselinia, Helwingia
 
family Cortinariaceae
a family of fungi belonging to the order Agaricales
 
family Crassulaceae
succulent shrubs and herbs
 
family Cryptogrammataceae
one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems
 
family Cucurbitaceae
a family of herbaceous vines (such as cucumber or melon or squash or pumpkin)
 
family Cunoniaceae
trees or shrubs or climbers; mostly southern hemisphere
 
family Cupressaceae
cypresses and junipers and many cedars
 
family Cyatheaceae
tropical tree ferns
 
family Cycadaceae
ancient palmlike plants closely related to ferns in that fertilization is by means of spermatozoids
 
family Cyperaceae
bulrush; chufa; cotton grass; papyrus; umbrella plant
 
family Cyrilliaceae
shrubs and trees with leathery leaves and small white flowers in racemes: genera Cyrilla and Cliftonia
 
family Dacrymycetaceae
a family of basidiomycetous fungi belonging to the order Tremellales having a bifurcate basidium that lacks septa
 
family Davalliaceae
one of a number of families into which Polypodiaceae has been subdivided in some classification systems
 
family Dematiaceae
family of imperfect mushrooms having dark-colored hyphae or conidia
 
family Dennstaedtiaceae
one of a number of families into which Polypodiaceae has been subdivided in some classification systems
 
family Diapensiaceae
north temperate low evergreen plants; in some classifications placed in its own order Diapensiales
 
family Dicksoniaceae
tree ferns: genera Dicksonia, Cibotium, Culcita, and Thyrsopteris elegans
 
family Dicranaceae
mosses having costate leaves and long-stalked capsules with cleft peristome
 
family Dilleniaceae
chiefly tropical shrubs and trees and climbers having leathery leaves or flattened leaflike stems: genera Dillenia and Hibbertia
 
family Dioscoreaceae
yams
 
family Dipsacaceae
chiefly southern European herbs with flowers usually in dense cymose heads
 
family Dipterocarpaceae
chiefly tropical Asian trees with two-winged fruits; yield valuable woods and aromatic oils and resins
 
family Droseraceae
a family of carnivorous herbs and shrubs
 
family Dryopteridaceae
alternative names for one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems
 
family Ebenaceae
fruit and timber trees of tropical and warm regions including ebony and persimmon
 
family Elaeagnaceae
shrubs or small trees often armed
 
family Elaeocarpaceae
genus of trees and shrubs widely distributed in warm regions some yielding useful timber; in some classifications included in the family Santalaceae
 
family Empetraceae
heathlike shrubs
 
family Entolomataceae
a family of fungi belonging to the order Agaricales
 
family Entomophthoraceae
mostly parasitic lower fungi that typically develop in the bodies of insects
 
family Epacridaceae
Australasian shrubs or small trees
 
family Ephedraceae
ephedras: in some classifications included in the Gnetaceae
 
family Equisetaceae
sole surviving family of the Equisetales: fern allies
 
family Ericaceae
heathers
 
family Eriocaulaceae
chiefly tropical aquatic or bog herbs: pipeworts
 
family Erysiphaceae
family of fungi parasitic mostly on leaves; includes powdery mildews
 
family Erythroxylaceae
a family of plants of order Geraniales; have drupaceous fruit
 
family Euphorbiaceae
a family of plants of order Geraniales
 
family Fagaceae
chiefly monoecious trees and shrubs: beeches; chestnuts; oaks; genera Castanea, Castanopsis, Chrysolepis, Fagus, Lithocarpus, Nothofagus, Quercus
 
family Fistulinaceae
a family of fungi closely related to the family Polyporaceae except that the tubes on the undersurface of the cap are separate from each other
 
family Flacourtiaceae
chiefly tropical trees and shrubs
 
family Fouquieriaceae
small family of spiny shrubs or trees of southwestern United States
 
family Fumariaceae
erect or climbing herbs of the northern hemisphere and southern Africa: bleeding heart; Dutchman's breeches; fumitory; squirrel corn
 
family Geastraceae
a family of earthstar fungi belonging to the order Lycoperdales
 
family Gentianaceae
chiefly herbaceous plants with showy flowers; some are cultivated as ornamentals
 
family Geoglossaceae
a family of fungi belonging to the order Helotiales
 
family Geraniaceae
chiefly herbaceous plants
 
family Gesneriaceae
large family of tropical herbs or shrubs or lianas; in some classification systems placed in the order Scrophulariales
 
family Ginkgoaceae
constituting the order Ginkgoales; includes the genus Ginkgo and extinct forms
 
family Gleicheniaceae
a family of ferns belonging to order Filicales
 
family Gnetaceae
plants having small unisexual flowers and fleshy or winged fruit: in some classifications includes the genera Ephedra and Welwitschia as well as genus Gnetum
 
family Goodeniaceae
a family of sappy plants that grow in Australasia and southeast China
 
family Graminaceae
the grasses: chiefly herbaceous but some woody plants including cereals; bamboo; reeds; sugar cane
 
family Grossulariaceae
in some classifications considered a part of the family Saxifragaceae: plants whose fruit is a berry
 
family Haemodoraceae
some genera placed in family Liliaceae
 
family Haloragidaceae
a family of dicotyledonous plants of the order Myrtales
 
family Hamamelidaceae
comprises genera Hamamelis, Corylopsis, Fothergilla, Liquidambar, Parrotia, and other small genera
 
family Helotiaceae
a fungus family of order Helotiales
 
family Helvellaceae
family of false morels or lorchels; some are edible and some are poisonous
 
family Hemerocallidaceae
one of many subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted; includes genus Hemerocallis
 
family Hippocastanaceae
trees having showy flowers and inedible nutlike seeds in a leathery capsule
 
family Hostaceae
one of many families or subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted; includes genus Hosta
 
family Hyacinthaceae
one of many families or subfamilies in which some classification systems subdivide the Liliaceae but not widely accepted
 
family Hydnaceae
tooth fungi
 
family Hydnoraceae
a family of flowering plants in Africa and Argentina that are parasitic on the roots of other plants
 
family Hydrangeaceae
sometimes included in the family Saxifragaceae
 
family Hydrocharitaceae
simple nearly stemless freshwater aquatic plants; widely distributed
 
family Hydrophyllaceae
perennial woodland herbs
 
family Hygrophoraceae
a family of fungi belonging to the order Agaricales; the gills of these fungi have a clean waxy appearance
 
family Hymenophyllaceae
terrestrial (hygrophytic) or epiphytic ferns: filmy ferns
 
family Hypericaceae
used in some classification systems for plants usually included among the Guttiferae
 
family Hypocreaceae
family of fungi having brightly colored fleshy or membranous ascocarps; sometimes placed in its own order Hypocreales
 
family Hypoxidaceae
in some classification systems included in the Amaryllidaceae
 
family Iridaceae
large family of usually perennial geophytic herbs with rhizomes or corms or bulbs
 
family Isoetaceae
quillworts; coextensive with the genus Isoetes
 
family Juglandaceae
trees having usually edible nuts: butternuts; walnuts; hickories; pecans
 
family Juncaceae
tufted herbs resembling grasses: rushes
 
family Jungermanniaceae
comprising the leafy members of the order Jungermanniales
 
family Lamiaceae
a large family of aromatic herbs and shrubs having flowers resembling the lips of a mouth and four-lobed ovaries yielding four one-seeded nutlets and including mint; thyme; sage; rosemary
 
family Lardizabalaceae
thick-stemmed lianas and some shrubs; some have edible fruit
 
family Lauraceae
a family of Lauraceae
 
family Lecanoraceae
a fungus family of the division Lichenes
 
family Lecythidaceae
large tropical trees bearing large fruits with woody skins
 
family Leguminosae
a large family of trees, shrubs, vines, and herbs bearing bean pods; divided for convenience into the subfamilies Caesalpiniaceae; Mimosaceae; Papilionaceae
 
family Leitneriaceae
coextensive with the genus Leitneria; commonly isolated in a distinct order
 
family Lemnaceae
family of small free-floating thalloid plants
 
family Lennoaceae
family of fleshy parasitic herbs lacking green foliage and having heads of small flowers; California and Mexico
 
family Lentibulariaceae
carnivorous aquatic or bog plants: genera Utricularia, Pinguicula, and Genlisea
 
family Lepidobotryaceae
family created in 1950 solely for the classification of a distinctive African tree repeatedly classified in other families; trees long believed to exist only in Africa
 
family Lepidodendraceae
fossil plants characterized by conspicuous spirally arranged leaf scars on the trunk
 
family Lepiotaceae
a family of fungi having free gills and a cap that is cleanly separable from the stalk
 
family Liliaceae
includes species sometimes divided among the following families: Alliaceae; Aloeaceae; Alstroemeriaceae; Aphyllanthaceae; Asparagaceae; Asphodelaceae; Colchicaceae; Convallariaceae; Hemerocallidaceae; Hostaceae; Hyacinthaceae; Melanthiaceae; Ruscaceae; Smilacaceae; Tecophilaeacea; Xanthorrhoeaceae
 
family Linaceae
a widely distributed family of plants
 
family Loasaceae
family of bristly hairy sometimes climbing plants; America and Africa and southern Arabia
 
family Lobeliaceae
not recognized in all classification systems; in some classifications lobeliaceous plants are included in family Campanulaceae
 
family Loganiaceae
a dicotyledonous family of plants of order Gentianales
 
family Lomariopsidaceae
small family of usually scandent ferns
 
family Lophosoriaceae
very small family of tree ferns
 
family Loranthaceae
in some classification includes Viscaceae: parasitic or hemiparasitic shrublets or shrubs or small trees of tropical and temperate regions; attach to hosts by haustoria
 
family Loxomataceae
very small family of New Zealand ferns
 
family Lycoperdaceae
a fungus family belonging to the order Lycoperdales; includes puffballs
 
family Lycopodiaceae
a family of ferns belonging to the order Lycopodiales
 
family Lythraceae
herbs and shrubs and small trees with pink or purple flowers
 
family Magnoliaceae
subclass Magnoliidae: genera Liriodendron, Magnolia, and Manglietia
 
family Malpighiaceae
tropical shrubs or trees
 
family Malvaceae
herbs and shrubs and some trees: mallows; cotton; okra
 
family Marantaceae
tropical perennial herbs with usually starchy rhizomes
 
family Marattiaceae
constituting the order Marattiales: chiefly tropical eusporangiate ferns with gigantic fronds
 
family Marchantiaceae
liverworts with prostrate and usually dichotomously branched thalli
 
family Marsileaceae
clover ferns
 
family Martyniaceae
in most classifications not considered a separate family but included in the Pedaliaceae
 
family Mayacaceae
a monocotyledonous family of bog plants of order Xyridales
 
family Melampsoraceae
rust fungi
 
family Melanthiaceae
one of many subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted: includes Aletris; Narthecium; Veratrum
 
family Melastomataceae
a family of trees and bushes and herbs of order Myrtales; many are cultivated as ornamentals
 
family Meliaceae
tropical trees and shrubs including many important timber and ornamental trees
 
family Menispermaceae
herbaceous or woody climbers
 
family Menyanthaceae
a dicotyledonous family of marsh plants of order Gentianales
 
family Mimosaceae
family of spiny woody plants (usually shrubs or small trees) whose leaves mimic animals in sensitivity to touch; commonly included in the family Leguminosae
 
family Mniaceae
family of erect mosses with club-shaped paraphyses and the hexagonal cells of the upper leaf surface; sometimes treated as a subfamily of Bryaceae
 
family Moniliaceae
family of imperfect fungi having white or brightly colored hyphae and spores that are produced directly on the mycelium and not aggregated in fruiting bodies
 
family Monotropaceae
used in some classification for saprophytic herbs sometimes included in the family Pyrolaceae: genera Monotropa and Sarcodes
 
family Moraceae
trees or shrubs having a milky juice; in some classifications includes genus Cannabis
 
family Morchellaceae
a family of edible fungi including the true morels
 
family Mucoraceae
large family of chiefly saprophytic fungi that includes many common molds destructive to food products
 
family Musaceae
treelike tropical Asian herbs
 
family Myricaceae
constituting the order Myricales
 
family Myristicaceae
family of aromatic tropical trees with arillate seeds
 
family Myrsinaceae
family of Old World tropical trees and shrubs; some in Florida
 
family Myrtaceae
trees and shrubs yielding a fragrant oil
 
family Najadaceae
monotypic family of aquatic plants having narrow leaves and small flowers
 
family Nepenthaceae
coextensive with the genus Nepenthes
 
family Nidulariaceae
bird's-nest fungi
 
family Nyctaginaceae
a family of flowering plants of the order Caryophyllales
 
family Nymphaeaceae
dicot aquatic plants
 
family Nyssaceae
a family of dicotyledonous trees of order Myrtales that includes the sour gum trees
 
family Ochnaceae
family of tropical evergreen trees and shrubs with thick shining parallel-veined leaves
 
family Oleaceae
trees and shrubs having berries or drupes or capsules as fruits; sometimes placed in the order Oleales: olive; ash; jasmine; privet; lilac
 
family Oleandraceae
one of a number of families into which Polypodiaceae has been subdivided in some classification systems
 
family Onagraceae
a large and widely distributed family of plants of the order Myrtales
 
family Ophioglossaceae
a family of succulent ferns of order Ophioglossales; cosmopolitan in distribution
 
family Orchidaceae
enormous cosmopolitan family of perennial terrestrial or epiphytic plants with fleshy tubers or rootstocks and unusual flowers
 
family Orobanchaceae
brown or yellow leafless herbs; sometimes placed in the order Scrophulariales
 
family Osmundaceae
large family of ferns widely distributed in temperate and tropical areas
 
family Oxalidaceae
a family of widely distributed herbs of the order Geraniales; have compound leaves and pentamerous flowers
 
family Paeoniaceae
perennial rhizomatous herbs and shrubs; of temperate Europe and North America
 
family Pandanaceae
family of woody plants of the order Pandanales including pandanus
 
family Papaveraceae
herbs or shrubs having milky and often colored juices and capsular fruits
 
family Papilionacea
leguminous plants whose flowers have butterfly-shaped corollas; commonly included in the family Leguminosae
 
family Parkeriaceae
coextensive with the genus Ceratopteris; sometimes included in family Polypodiaceae
 
family Parmeliaceae
a family of lichens
 
family Passifloraceae
tropical woody tendril-climbing vines
 
family Pedaliaceae
the family of plants of order Polemoniales
 
family Peronosporaceae
parasitic fungi: downy mildews
 
family Pertusariaceae
a fungus family of division Lichenes
 
family Pezizaceae
large family comprising many typical cup fungi
 
family Phallaceae
a family of fungi belonging to the order Phallales and comprising the true stinkhorns
 
family Phyllocladaceae
a family of Phyllocladaceae
 
family Phytolaccaceae
chiefly tropical herbaceous plants (including shrubs and trees) with racemose flowers: genera Phytolacca, Agdestis, Ercilla, Rivina, Trichostigma
 
family Pinaceae
a family of Pinaceae
 
family Piperaceae
tropical woody vines and herbaceous plants having aromatic herbage and minute flowers in spikelets
 
family Plantaginaceae
cosmopolitan family of small herbs and a few shrubs; most are troublesome weeds
 
family Plasmodiophoraceae
family of fungi often causing hypertrophy in seed plants
 
family Platanaceae
coextensive with the genus Platanus: plane trees
 
family Plumbaginaceae
perennial herbs and shrubs and lianas; cosmopolitan especially in saltwater areas
 
family Pluteaceae
a family of fungi belonging to the order Agaricales
 
family Podocarpaceae
gymnosperms with simple persistent needlelike or scalelike leaves
 
family Polemoniaceae
a widely distributed family of chiefly herbaceous plants of the order Polemoniales; often have showy flowers
 
family Polygalaceae
trees, shrubs, and herbs widely distributed throughout both hemispheres
 
family Polygonaceae
a family of plants of order Polygonales chiefly of the north temperate zone; includes the buckwheats
 
family Polypodiaceae
ferns: a large family that in some classification systems has been subdivided into several families (including Aspleniaceae and Blechnaceae and Davalliaceae and Dennstaedtiaceae and Dryopteridaceae and Oleandraceae and Pteridaceae)
 
family Polyporaceae
fungi that become corky or woody with age, often forming shelflike growths on trees
 
family Pontederiaceae
aquatic or bog plants
 
family Portulacaceae
family of usually succulent herbs; cosmopolitan in distribution especially in Americas
 
family Potamogetonaceae
plants that grow in ponds and slow streams; sometimes includes family Zosteraceae
 
family Primulaceae
a dicotyledonous family of the order Primulales with a regular flower; widely distributed in the northern hemisphere
 
family Proteaceae
large family of Australian and South African shrubs and trees with leathery leaves and clustered mostly tetramerous flowers; constitutes the order Proteales
 
family Psilophytaceae
Paleozoic plants
 
family Psilotaceae
small family of lower ferns having nearly naked stems and minute scalelike leaves
 
family Pteridaceae
one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems; Pteridaceae is itself in turn sometimes further subdivided
 
family Pucciniaceae
large important family of rust fungi
 
family Punicaceae
one species: pomegranates
 
family Pyrolaceae
evergreen herbs of temperate regions: genera Pyrola, Chimaphila, Moneses, Orthilia
 
family Pythiaceae
fungi having sporangia usually borne successively and singly at the tips of branching sporangiophores
 
family Rafflesiaceae
a family of parasitic plants of the order Aristolochiales
 
family Ranunculaceae
a family of Ranunculaceae
 
family Rapateaceae
South American herbs somewhat resembling members of the Juncaceae
 
family Resedaceae
mainly Mediterranean herbs: mignonette
 
family Rhamnaceae
trees and shrubs usually thorny bearing drupaceous fruit many having medicinal value
 
family Rhizophoraceae
trees and shrubs that usually form dense jungles along tropical seacoasts
 
family Rhizopogonaceae
a family of fungi of order Hymenogastrales having round subterranean sporophores
 
family Rhyniaceae
primitive plants of the Paleozoic
 
family Roccellaceae
a fungus family of division Lichenes
 
family Roridulaceae
in some classifications included in the family Droseraceae
 
family Rosaceae
a large family of dicotyledonous plants of order Rosales; have alternate leaves and five-petaled flowers with numerous stamens
 
family Rubiaceae
widely distributed family of mostly tropical trees and shrubs and herbs; includes coffee and chinchona and gardenia and madder and bedstraws and partridgeberry
 
family Ruscaceae
one of many subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted
 
family Russulaceae
used in some classification systems for the genus Russula
 
family Rutaceae
a family of dicotyledonous plants of order Geraniales; have flowers that are divide into four or five parts and usually have a strong scent
 
family Saccharomycetaceae
family of fungi comprising the typical yeasts: reproduce by budding and ferment carbohydrates
 
family Salicaceae
two genera of trees or shrubs having hairy catkins: Salix; Populus
 
family Salvadoraceae
a family of Old World shrubs and trees of order Gentianales; related to Oleaceae but having four stamens and four petals
 
family Salviniaceae
water ferns
 
family Santalaceae
chiefly tropical herbs or shrubs or trees bearing nuts or one-seeded fruit
 
family Sapindaceae
chiefly tropical New and Old World deciduous and evergreen trees and shrubs bearing leathery drupes with yellow translucent flesh; most plants produce toxic saponins
 
family Sapotaceae
tropical trees or shrubs with milky juice and often edible fleshy fruit
 
family Sarcoscyphaceae
family of fungi belonging to the order Pezizales
 
family Sarraceniaceae
insectivorous plants
 
family Saururaceae
family of perennial aromatic herbs: genera Saururus, Anemopsis, Houttuynia
 
family Saxifragaceae
a large and diverse family of evergreen or deciduous herbs; widely distributed in northern temperate and cold regions; sometimes includes genera of the family Hydrangeaceae
 
family Scheuchzeriaceae
a family of monocotyledonous bog herbs of order Naiadales
 
family Schizaeaceae
small family of mainly tropical ferns
 
family Schizosaccharomycetaceae
a family of fungi belonging to order Endomycetales
 
family Sciadopityaceae
family comprising a single genus that until recently was considered part of Taxodiaceae
 
family Sclerodermataceae
a family of fungi or order Sclerodermatales with a single-layered peridium; includes earthballs
 
family Sclerotiniaceae
a fungus family of order Helotiales
 
family Scrophulariaceae
a family of dicotyledonous plants of the order Polemoniales; includes figwort and snapdragon and foxglove and toadflax and speedwell and mullein; in some classifications placed in the order Scrophulariales
 
family Secotiaceae
a family of fungi that have a stalk and cap and a wrinkled mass of tissue (the gleba) where spores are produced; are often dismissed as misshapen forms of other fungi
 
family Selaginellaceae
lesser club mosses: terrestrial chiefly tropical plants resembling mosses
 
family Septobasidiaceae
a family of fungi belonging to the subdivision Basidiomycota
 
family Simaroubaceae
chiefly tropical trees and shrubs with bitter bark having dry usually one-seeded winged fruit
 
family Solanaceae
large and economically important family of herbs or shrubs or trees often strongly scented and sometimes narcotic or poisonous; includes the genera Solanum, Atropa, Brugmansia, Capsicum, Datura, Hyoscyamus, Lycopersicon, Nicotiana, Petunia, Physalis, and Solandra
 
family Sparganiaceae
coextensive with the genus Sparganium
 
family Sphaeriaceae
parasitic fungi having globose and sometimes necked or beaked perithecia
 
family Sphaerobolaceae
monotypic family of fungi in which the more or less spherical gleba is forcibly ejected at maturity
 
family Sphaerocarpaceae
liverworts with bilaterally symmetrical gametophytes; sometimes placed in the order Jungermanniales
 
family Staphylaceae
a family of dicotyledonous plants of order Sapindales found mostly in the north temperate zone
 
family Sterculiaceae
a large family of plants of order Malvales
 
family Strelitziaceae
woody plants with erect stems of tropical South America and South Africa and Madagascar; in some classifications included in the family Musaceae
 
family Strophariaceae
sometimes included in family Agaricaceae
 
family Styracaceae
a widely distributed family of shrubs and trees of order Ebenales
 
family Symplocaceae
a dicotyledonous family of order Ebenales
 
family Synchytriaceae
a fungus family of order Chytridiales
 
family Taccaceae
small family of tropical herbs
 
family Tamaricaceae
family of desert shrubs and trees (mostly halophytes and xerophytes)
 
family Taxaceae
sometimes classified as member of order Taxales
 
family Tecophilaeacea
one of many subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted
 
family Tetragoniaceae
succulent herbs or small shrubs mostly of South Africa but also New Zealand and North America: carpetweeds; fig marigolds
 
family Theaceae
a family of trees and shrubs of the order Parietales
 
family Thelephoraceae
fungi having leathery or membranous sporophores
 
family Thelypteridaceae
genera Thelypteris, Phegopteris, and others
 
family Theophrastaceae
family of mainly tropical American trees and shrubs similar to those of the Myrsinaceae; often included in the Myrsinaceae
 
family Thymelaeaceae
family of trees and shrubs and herbs having tough bark that are found especially in Australia and tropical Africa
 
family Tiliaceae
chiefly trees and shrubs of tropical and temperate regions of especially southeastern Asia and Brazil; genera Tilia, Corchorus, Entelea, Grewia, Sparmannia
 
family Tilletiaceae
a family of smut fungi having a simple promycelium bearing the spores in an apical cluster
 
family Trapaceae
family comprising solely the genus Trapa; in some classifications treated as a subfamily or tribe of the family Onagraceae
 
family Tremellaceae
a family of basidiomycetous fungi of the order Tremellales that have the basidium divided longitudinally
 
family Tricholomataceae
a family of fungi belonging to the order Agaricales
 
family Trilliaceae
small family of herbs having flowers with 3 petals and 3 sepals; in some classification systems considered a subfamily of the Liliaceae
 
family Tropaeolaceae
coextensive with the genus Tropaeolum
 
family Tuberaceae
family of fungi whose ascocarps resemble tubers and vary in size from that of an acorn to that of a large apple
 
family Tuberculariaceae
large family of mainly saprophytic imperfect fungi
 
family Tulostomataceae
stalked puffballs
 
family Typhaceae
perennial marsh plants with creeping rootstocks and long linear leaves
 
family Ulmaceae
a dicot family of the order Urticales including: genera Ulmus, Celtis, Planera, Trema
 
family Umbelliferae
plants having flowers in umbels: parsley; carrot; anise; caraway; celery; dill
 
family Urticaceae
a family of plants of order Urticales including many nettles with stinging hairs
 
family Usneaceae
fruticose lichens having prostrate or erect or pendulous thalli: genera Usnea, Evernia, Ramalina, Alectoria
 
family Ustilaginaceae
a fungus family of loose smuts
 
family Valerianaceae
genus of mostly herbs having a characteristic fetid odor
 
family Verbenaceae
family of New World tropical and subtropical herbs and shrubs and trees
 
family Violaceae
a family of order Parietales including the genera Viola, Hybanthus, Hymenanthera, Melicytus
 
family Viscaceae
in some classifications considered a subfamily of Loranthaceae
 
family Vitaceae
a family of vines belonging to order Rhamnales
 
family Vittariaceae
one of a number of families into which Polypodiaceae has been subdivided in some classification systems: genus Vittaria
 
family Volvariaceae
a family of fungi belonging to the order Agaricales
 
family Welwitschiaceae
in some classifications included in the Gnetaceae
 
family Winteraceae
small family of chiefly tropical shrubs and trees of genera Drimys and Pseudowintera; sometimes included in Magnoliaceae
 
family Xanthorrhoeaceae
one of many subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted
 
family Xylariaceae
family of fungi characterized by dark brown to black spores
 
family Xyridaceae
plants of tropical to temperate regions; usually in wet places
 
family Zamiaceae
a family of cycads often included in the family Cycadaceae: zamias
 
family Zannichelliaceae
alternative classification for some genera included in Potamogetonaceae; one species
 
family Zingiberaceae
a family of tropical monocotyledonous plants of order Musales
 
family Zosteraceae
used in some classifications: essentially equivalent to Potamogetonaceae
 
family Zygophyllaceae
small trees, shrubs, and herbs of warm arid and saline regions; often resinous; some poisonous: genera Zygophyllum, Tribulus, Guaiacum, Larrea
 
fan palm
palm having palmate or fan-shaped leaves
 
feather palm
palm having pinnate or featherlike leaves
 
featherfoil
a plant of the genus Hottonia
 
February daphne
small European deciduous shrub with fragrant lilac-colored flowers followed by red berries on highly toxic twigs
 
feijoa
South American shrub having edible greenish plumlike fruit
 
Felicia amelloides
hairy South African or Australian subshrub that has daisylike flowers with blue rays
 
Felicia bergeriana
softly hairy South African herb having flowers with bright blue rays
 
felwort
gentian of Europe and China having creamy white flowers with fringed corollas
 
fennel
any of several aromatic herbs having edible seeds and leaves and stems
 
fern
any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
 
fern ally
pteridophytes of other classes than Filicopsida
 
fern family
families of ferns and fern allies
 
fern genus
genera of ferns and fern allies
 
fern seed
the asexual spore of ferns that resembles dust; once thought to be seeds and to make the possessor invisible
 
Festuca elatior
grass with wide flat leaves cultivated in Europe and America for permanent pasture and hay and for lawns
 
Festuca ovina
cultivated for sheep pasturage in upland regions or used as a lawn grass
 
fever tree
any of several trees having leaves or bark used to allay fever or thought to indicate regions free of fever
 
fibrous-rooted begonia
any of numerous begonias having fibrous rather than tuberous or rhizomatous roots
 
fibrovascular bundle
a unit strand of the vascular system in stems and leaves of higher plants consisting essentially of xylem and phloem
 
Ficus carica
Mediterranean tree widely cultivated for its edible fruit
 
Ficus carica sylvestris
wild variety of the common fig used to facilitate pollination of certain figs
 
Ficus diversifolia
shrub or small tree often grown as a houseplant having foliage like mistletoe
 
Ficus religiosa
fig tree of India noted for great size and longevity; lacks the prop roots of the banyan; regarded as sacred by Buddhists
 
Ficus rubiginosa
Australian tree resembling the banyan often planted for ornament; introduced into South Africa for brushwood
 
Ficus sycomorus
thick-branched wide-spreading tree of Africa and adjacent southwestern Asia often buttressed with branches rising from near the ground; produces cluster of edible but inferior figs on short leafless twigs; the biblical sycamore
 
field corn
corn grown primarily for animal feed or market grain
 
field crop
a crop (other than fruits or vegetables) that is grown for agricultural purposes
 
field pea
seed of the field pea plant
 
field pussytoes
a variety of pussytoes
 
fig leaf
a leaf from a fig tree
 
fig marigold
any of several South African plants of the genus Mesembryanthemum cultivated for showy pink or white flowers
 
fig tree
any moraceous tree of the tropical genus Ficus; produces a closed pear-shaped receptacle that becomes fleshy and edible when mature
 
figwort
any of numerous tall coarse woodland plants of the genus Scrophularia
 
Filago germanica
(literally an undutiful herb) a variety of cotton rose
 
filament
the stalk of a stamen
 
film fern
any fern of the genus Hymenophyllum growing in tropical humid regions and having translucent leaves
 
finger grass
any grass of the genus Chloris; occurs in short grassland especially on waste ground or poor soils
 
fir
nonresinous wood of a fir tree
 
fir cone
the seed-producing cone of a fir tree
 
fir
any of various evergreen trees of the genus Abies; chiefly of upland areas
 
Fischer's slime mushroom
a type of slime mushroom
 
fishtail palm
attractive East Indian palm having distinctive bipinnate foliage
 
Fistulina hepatica
a popular edible fungus with a cap the color of liver or raw meat; abundant in southeastern United States
 
Flacourtia indica
small shrubby tree of Madagascar cultivated in tropical regions as a hedge plant and for its deep red acid fruits resembling small plums
 
flag smut fungus
a smut fungus causing a smut in cereals and other grasses that chiefly affects leaves and stems and is characterized chains of sori within the plant tissue that later rupture releasing black masses of spores
 
flag
plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals
 
flame flower
a plant of the genus Kniphofia having long grasslike leaves and tall scapes of red or yellow drooping flowers
 
flame pea
any of several small shrubs or twining vines having entire or lobed leaves and racemes of yellow to orange-red flowers; Australia
 
Flammulina velutipes
an edible agaric that is available in early spring or late fall when few other mushrooms are; has a viscid smooth orange to brown cap and a velvety stalk that turns black in maturity and pallid gills; often occur in clusters
 
flannel leaf
any of various plants of the genus Verbascum having large usually woolly leaves and terminal spikes of yellow or white or purplish flowers
 
flat-topped white aster
a variety of aster
 
flax
plant of the genus Linum that is cultivated for its seeds and for the fibers of its stem
 
fleabane
any of several North American plants of the genus Erigeron having daisylike flowers; formerly believed to repel fleas
 
flesh
a soft moist part of a fruit
 
Flindersia australis
tall Australian timber tree yielding tough hard wood used for staves etc
 
Flindersia schottiana
Australian timber tree whose bark yields a poison
 
flooded gum
any of several Australian gum trees growing on moist or alluvial soil
 
floral leaf
a modified leaf that is part of a flower
 
floret
a diminutive flower (especially one that is part of a composite flower)
 
Florida arrowroot
small tough woody zamia of Florida and West Indies and Cuba; roots and half-buried stems yield an arrowroot
 
Florida strangler fig
a strangler tree native to southern Florida and West Indies; begins as an epiphyte eventually developing many thick aerial roots and covering enormous areas
 
Florida strap fern
common epiphytic or sometimes terrestrial fern having pale yellow-green strap-shaped leaves; Florida to West Indies and Mexico and south to Uruguay
 
flower
a plant cultivated for its blooms or blossoms
 
flower bud
a bud from which only a flower or flowers develop
 
flower cluster
an inflorescence consisting of a cluster of flowers
 
flower head
a shortened compact cluster of flowers so arranged that the whole gives the effect of a single flower as in clover or members of the family Compositae
 
flower petal
part of the perianth that is usually brightly colored
 
flower stalk
erect leafless flower stalk growing directly from the ground as in a tulip
 
flowering cherry
any of several shrubs or trees of the genus Prunus cultivated for their showy white or pink single or double blossoms
 
flowering fern
any fern of the genus Osmunda: large ferns with creeping rhizomes; naked sporangia are on modified fronds that resemble flower clusters
 
flowering glume
the lower and stouter of the two glumes immediately enclosing the floret in most Gramineae
 
flowering hazel
any of several Asiatic deciduous shrubs cultivated for their nodding racemes of yellow flowers that appear before the leaves
 
flowering maple
an ornamental plant of the genus Abutilon having leaves that resemble maple leaves
 
flowering quince
Asiatic ornamental shrub with spiny branches and pink or red blossoms
 
flowering shrub
shrub noted primarily for its flowers
 
flowering stone
any plant of the genus Lithops native to Africa having solitary yellow or white flowers and thick leaves that resemble stones
 
fly orchid
any of several dwarf creeping orchids with small bizarre insect-like hairy flowers on slender stalks
 
Foeniculum vulgare
strongly aromatic with a smell of aniseed; leaves and seeds used for seasoning
 
Foeniculum vulgare dulce
grown especially for its edible aromatic bulbous stem base
 
foliage
the main organ of photosynthesis and transpiration in higher plants
 
Fomes igniarius
fungus used in the preparation of punk for fuses
 
forestiera
any plant of the genus Forestiera
 
Forestiera neomexicana
spiny branching deciduous shrub of southwestern United States having clusters of insignificant yellow-white flowers appearing before leaves followed by attractive black berrylike fruits
 
form genus Rhizoctinia
form genus of imperfect fungi some species of which are now placed in genera Pellicularia and Corticium because their perfect stages have been found
 
forsythia
any of various early blooming oleaceous shrubs of the genus Forsythia; native to eastern Asia and southern Europe but widely cultivated for their branches of bright yellow bell-shaped flowers
 
Fortunella japonica
shrub bearing round-fruited kumquats
 
Fortunella margarita
shrub bearing oval-fruited kumquats
 
fothergilla
any of several deciduous low-growing shrubs of the genus Fothergilla having showy brushlike spikes of white flowers in spring and fiery red and orange autumn color; grows from Alabama to the Allegheny Mountains
 
Fouquieria columnaris
candlewood of Mexico and southwestern California having tall columnar stems and bearing honey-scented creamy yellow flowers
 
Fouquieria splendens
desert shrub of southwestern United States and Mexico having slender naked spiny branches that after the rainy season put forth foliage and clusters of red flowers
 
four o'clock
any of several plants of the genus Mirabilis having flowers that open in late afternoon
 
foxtail orchid
any of various orchids of the genus Rhyncostylis having pink- to purple-marked white flowers in a dense cylindrical raceme
 
foxtail
grasses of the genera Alopecurus and Setaria having dense silky or bristly brushlike flowering spikes
 
Fragaria ananassa
widely cultivated
 
Fragaria chiloensis
wild strawberry of western United States and South America; source of many varieties of cultivated strawberries
 
Fragaria vesca
Europe
 
Francoa ramosa
Chilean evergreen shrub having delicate spikes of small white flowers
 
frangipani
any of various tropical American deciduous shrubs or trees of the genus Plumeria having milky sap and showy fragrant funnel-shaped variously colored flowers
 
Fraxinus Americana
spreading American ash with leaves pale green or silvery beneath and having hard brownish wood
 
Fraxinus caroliniana
small ash of swampy areas of southeastern United States
 
Fraxinus cuspidata
shrubby ash of southwestern United States having fragrant white flowers
 
Fraxinus dipetala
shrubby California ash with showy off-white flowers
 
Fraxinus latifolia
timber tree of western North America yielding hard light wood; closely related to the red ash
 
Fraxinus nigra
vigorous spreading North American tree having dark brown heavy wood; leaves turn gold in autumn
 
Fraxinus ornus
southern Mediterranean ash having fragrant white flowers in dense panicles and yielding manna
 
Fraxinus pennsylvanica
smallish American tree with velvety branchlets and lower leaf surfaces
 
Fraxinus pennsylvanica subintegerrima
a variety of red ash having glossy branchlets and lower leaf surfaces
 
Fraxinus quadrangulata
ash of central and southern United States with bluish-green foliage and hard brown wood
 
Fraxinus texensis
low-growing ash of Texas
 
Fraxinus tomentosa
timber tree of central and southeastern United States having hairy branchlets and a swollen trunk base
 
Fraxinus velutina
small shrubby ash of southwestern United States and northwestern Mexico
 
free central placentation
where ovules develop on a central column in a compound ovary lacking septa or with septa at base only
 
freesia
any of several plants of the genus Freesia valued for their one-sided clusters of usually fragrant yellow or white or pink tubular flowers
 
French honeysuckle
European herb with small fragrant crimson or white spurred flowers
 
French marigold
strong-scented bushy annual with orange or yellow flower heads marked with red; Mexico and Guatemala
 
frijol
the common bean plant grown for the beans rather than the pods (especially a variety with large red kidney-shaped beans)
 
fringe tree
any of various small decorative flowering trees or shrubs of the genus Chionanthus
 
fringed gentian
any of various herbs of the genus Gentianopsis having the margins of the corolla lobes fringed; sometimes included in genus Gentiana
 
fringed grass of Parnassus
bog plant with broadly heart-shaped basal leaves and cream-colored or white saucer-shaped flowers with fringed petals; west of Rocky Mountains from Alaska to New Mexico
 
fringed orchid
any of several summer-flowering American orchids distinguished by a fringed or lacerated lip
 
fringepod
annual herb having pinnatifid basal leaves and slender racemes of small white flowers followed by one-seeded winged silicles
 
Fritillaria agrestis
a malodorous California herb with bell-shaped flowers; a common weed in grainfields
 
Fritillaria biflora
herb of southwestern United States having dark purple bell-shaped flowers mottled with green
 
Fritillaria imperialis
Eurasian herb with a cluster of leaves and orange-red bell-shaped flowers at the top of the stem
 
Fritillaria lanceolata
herb of northwestern America having green-and-purple bell-shaped flowers
 
Fritillaria liliaceae
California herb with white conic or bell-shaped flowers usually tinged with green
 
Fritillaria meleagris
Eurasian checkered lily with pendant flowers usually veined and checkered with purple or maroon on a pale ground and shaped like the bells carried by lepers in medieval times; widely grown as an ornamental
 
Fritillaria parviflora
California herb with brownish-purple or greenish bell-shaped flowers
 
Fritillaria pluriflora
California herb with pinkish purple flowers
 
Fritillaria recurva
western United States herb with scarlet and yellow narrow bell-shaped flowers
 
frog orchid
any of several green orchids of the genus Habenaria
 
frog's lettuce
very similar to Potamogeton; of western Africa, Asia, and Europe
 
frond
compound leaf of a fern or palm or cycad
 
fructification
organs of fruiting (especially the reproductive parts of ferns and mosses)
 
fruit
the ripened reproductive body of a seed plant
 
fruit tree
tree bearing edible fruit
 
fruitage
the yield of fruit
 
fruiting body
an organ specialized for producing spores
 
fruitlet
a diminutive fruit, especially one that is part of a multiple fruit
 
fruitwood
wood of various fruit trees (as apple or cherry or pear) used especially in cabinetwork
 
fuchsia
any of various tropical shrubs widely cultivated for their showy drooping purplish or reddish or white flowers; Central and South America and New Zealand and Tahiti
 
Fuchsia coccinea
erect or climbing shrub of Brazil with deep pink to red flowers
 
Fuchsia excorticata
erect deciduous shrub or tree to 10 feet with maroon flowers; New Zealand
 
Fumaria officinalis
delicate European herb with greyish leaves and spikes of purplish flowers; formerly used medicinally
 
fumed oak
oak given a weathered appearance by exposure to fumes of ammonia; used for cabinetwork
 
fungus
an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia
 
fungus family
includes lichen families
 
fungus genus
includes lichen genera
 
fungus order
the order of fungi
 
funicle
the stalk of a plant ovule or seed
 
Fusanus acuminatus
Australian tree with edible flesh and edible nutlike seed
 
Fuscoboletinus paluster
an edible fungus with a pinkish purple cap and stalk and a pore surface that is yellow with large angular pores that become like gills in maturity
 
Fuscoboletinus serotinus
an edible fungus with a broadly convex brown cap and a whitish pore surface and stalk
 
fuzz
filamentous hairlike growth on a plant
 
gaillardia
any plant of western America of the genus Gaillardia having hairy leaves and long-stalked flowers in hot vibrant colors from golden yellow and copper to rich burgundy
 
Gaillardia pulchella
annual of central United States having showy long-stalked yellow flower heads marked with scarlet or purple in the center
 
Galax urceolata
tufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall
 
galbulus
the seed-producing cone of a cypress tree
 
galea
an organ shaped like a helmet; usually a vaulted and enlarged petal as in Aconitum
 
Galega officinalis
tall bushy European perennial grown for its pinnate foliage and slender spikes of blue flowers; sometimes used medicinally
 
Galeopsis tetrahit
coarse bristly Eurasian plant with white or reddish flowers and foliage resembling that of a nettle; common as a weed in United States
 
Galiella rufa
the cup-shaped fruiting body of this discomycete has a jellylike interior and a short stalk
 
Galium aparine
annual having the stem beset with curved prickles; North America and Europe and Asia
 
Galium lanceolatum
bedstraw with sweetish roots
 
Galium mollugo
Eurasian herb with ample panicles of small white flowers; naturalized in North America
 
gall
abnormal swelling of plant tissue caused by insects or microorganisms or injury
 
gametangium
cell or organ in which gametes develop
 
gametoecium
gametangia and surrounding bracts
 
gametophore
a modified branch bearing gametangia as in the thalloid liverworts
 
gametophyte
the gamete-bearing individual or phase in the life cycle of a plant having alternation of generations
 
Garcinia gummi-gutta
low spreading tree of Indonesia yielding an orange to brown gum resin (gamboge) used as a pigment when powdered
 
Garcinia mangostana
East Indian tree with thick leathery leaves and edible fruit
 
garden pea
the flattened to cylindric inflated multi-seeded fruit of the common pea plant
 
garden pink
any of various flowers of plants of the genus Dianthus cultivated for their fragrant flowers
 
garden plant
any of a variety of plants usually grown especially in a flower or herb garden
 
gardenia
any of various shrubs and small trees of the genus Gardenia having large fragrant white or yellow flowers
 
Gardenia jasminoides
evergreen shrub widely cultivated for its large fragrant waxlike white flowers and glossy leaves
 
gasteromycete
any fungus of the class Gasteromycetes
 
Gastroboletus scabrosus
a dingy yellow brown fungus with a rough stalk that superficially resembles a bolete
 
Gastroboletus turbinatus
a fungus with a cap that can vary from red to dark brown; superficially resembles a bolete
 
Gastrocybe lateritia
a species of Gastrocybe fungus that has a conic cap and a thin stalk; at first the stalk is upright but as it matures the stalk bends over and then downward; the cap then gelatinizes and a slimy mass containing the spores falls to the ground as the stalk collapses
 
gastrolobium
any of various Australian evergreen shrubs of the genus Gastrolobium having whorled compound leaves poisonous to livestock and showy yellow to deep reddish-orange flowers followed by two-seeded pods
 
Gaultheria hispidula
slow-growing procumbent evergreen shrublet of northern North America and Japan having white flowers and numerous white fleshy rough and hairy seeds
 
Gaultheria procumbens
creeping shrub of eastern North America having white bell-shaped flowers followed by spicy red berrylike fruit and shiny aromatic leaves that yield wintergreen oil
 
Gaultheria shallon
small evergreen shrub of Pacific coast of North America having edible dark purple grape-sized berries
 
Gaylussacia baccata
low shrub of the eastern United States bearing shiny black edible fruit; best known of the huckleberries
 
Gaylussacia brachycera
creeping evergreen shrub of southeastern United States having small shiny boxlike leaves and flavorless berries
 
Gaylussacia frondosa
huckleberry of the eastern United States with pink flowers and sweet blue fruit
 
gazania
any plant of the genus Gazania valued for their showy daisy flowers
 
Gazania rigens
decumbent South African perennial with short densely leafy stems and orange flower rays with black eyespots at base
 
gean
wild or seedling sweet cherry used as stock for grafting
 
Geastrum coronatum
an earthstar with a bluish spore sac and a purplish brown gleba; at maturity the outer layer splits into rays that bend backward and elevate the spore sac
 
geebung
any of numerous shrubs and small trees having hard narrow leaves and long-lasting yellow or white flowers followed by small edible but insipid fruits
 
Geglossaceae
a type of ascomycetous fungus
 
Gelsemium sempervirens
poisonous woody evergreen vine of southeastern United States having fragrant yellow funnel-shaped flowers
 
gemma
small asexual reproductive structure in e.g. liverworts and mosses that detaches from the parent and develops into a new individual
 
genipa
any tree of the genus Genipa bearing yellow flowers and edible fruit with a thick rind
 
Genipa Americana
tree of the West Indies and northern South America bearing succulent edible orange-sized fruit
 
Genista anglica
prickly yellow-flowered shrub of the moors of New England and Europe
 
Genista hispanica
erect shrub of southwestern Europe having racemes of golden yellow flowers
 
Genista raetam
desert shrub of Syria and Arabia having small white flowers; constitutes the juniper of the Old Testament; sometimes placed in genus Genista
 
Genista tinctoria
small Eurasian shrub having clusters of yellow flowers that yield a dye; common as a weed in Britain and the United States; sometimes grown as an ornamental
 
genlisea
rootless carnivorous swamp plants having at the base of the stem a rosette of foliage and leaves consisting of slender tubes swollen in the middle to form traps; each tube passes into two long spirally twisted arms with stiff hairs
 
gentian
any of various plants of the family Gentianaceae especially the genera Gentiana and Gentianella and Gentianopsis
 
Gentiana acaulis
low-growing alpine plant cultivated for its dark glossy green leaves in basal rosettes and showy solitary bell-shaped blue flowers
 
Gentiana andrewsii
gentian of eastern North America having tubular blue or white flowers that open little if at all
 
Gentiana calycosa
tufted sometimes sprawling perennial with blue flowers spotted with green; western North America
 
Gentiana clausa
similar to Gentiana andrewsii but with larger flowers
 
Gentiana lutea
robust European perennial having clusters of yellow flowers
 
Gentiana pneumonanthe
perennial Eurasian gentian with sky-blue funnel-shaped flowers of damp open heaths
 
Gentiana saponaria
erect perennial of wet woodlands of North America having leaves and flower buds resembling those of soapwort
 
Gentiana villosa
a perennial marsh gentian of eastern North America
 
Gentianella quinquefolia
gentian of eastern North America having clusters of bristly blue flowers
 
Gentianopsid procera
small blue-flowered fringed gentian of east central North America
 
Gentianopsis crinita
tall widely distributed fringed gentian of eastern North America having violet-blue or white fringed flowers
 
Gentianopsis detonsa
medium-tall fringed gentian with pale-blue to blue-purple flowers; circumboreal in distribution
 
Gentianopsis holopetala
small blue-flowered fringed gentian of Sierra Nevada mountains
 
Gentianopsis thermalis
small blue-flowered fringed gentian of western United States (Rocky Mountains) especially around hot springs in Yellowstone National Park
 
genus Abelia
chiefly east Asian shrubs
 
genus Abelmoschus
genus of tropical coarse herbs having large lobed leaves and often yellow flowers
 
genus Abies
true firs
 
genus Abronia
genus of western North American herbs having showy flowers
 
genus Abutilon
herbs or shrubs or small trees: flowering maple; Indian mallow
 
genus Acacia
large genus of shrubs and trees and some woody vines of Central and South America, Africa, Australia and Polynesia: wattle; mimosa
 
genus Acalypha
a genus of herbs and shrubs belonging to the family Euphorbiaceae
 
genus Acanthocereus
mostly trailing cacti having nocturnal white flowers; tropical America and Caribbean region
 
genus Acanthus
bear's breeches
 
genus Acer
type genus of the Aceraceae; trees or shrubs having winged fruit
 
genus Achillea
perennial often aromatic and sometimes mat-forming herbs of north temperate regions: yarrow; milfoil
 
genus Achimenes
genus of tropical perennial American herbs
 
genus Achras
tropical trees having papery leaves and large fruit
 
genus Acinos
plants closely allied to the genera Satureja and Calamintha
 
genus Acocanthera
small genus of trees and shrubs containing strongly toxic cardiac glycosides; Arabia to Africa
 
genus Aconitum
genus of poisonous plants of temperate regions of northern hemisphere with a vaulted and enlarged petal
 
genus Acorus
sweet flags; sometimes placed in subfamily Acoraceae
 
genus Acrocarpus
small genus of trees of Indonesia and Malaysia
 
genus Acroclinium
genus of herbs and shrubs of Australia and South Africa: everlasting flower; most species usually placed in genus Helipterum
 
genus Acrocomia
Central and South American feather palms
 
genus Acrostichum
in some classification systems placed in family Polypodiaceae
 
genus Actaea
baneberry
 
genus Actinidia
small Asiatic woody vine bearing many-seeded fruit
 
genus Actiniopteris
terrestrial ferns of tropical Asia and Africa
 
genus Actinomeris
used in some classification systems for plants now included in genus Verbesina
 
genus Adansonia
baobab; cream-of-tartar tree
 
genus Adenanthera
small genus of trees of tropical Asia and Pacific areas
 
genus Adenium
one species: succulent shrub or tree of tropical Africa and Arabia
 
genus Adiantum
cosmopolitan genus of ferns: maidenhair ferns; in some classification systems placed in family Polypodiaceae or Adiantaceae
 
genus Adlumia
one species: climbing fumitory
 
genus Adonis
annual or perennial herbs
 
genus Aegiceras
a genus of herbs of the family Verbenaceae
 
genus Aegilops
goat grass
 
genus Aeonium
a genus of plants of the family Crassulaceae
 
genus Aerides
epiphytic orchids of tropical Asia having stiff leaves and fragrant white flowers in arching racemes
 
genus Aeschynanthus
large genus of East Indian ornamental woody epiphytic plants
 
genus Aesculus
deciduous trees or some shrubs of North America; southeastern Europe; eastern Asia
 
genus Aethionema
Old World genus of the family Cruciferae
 
genus Aethusa
fool's parsley
 
genus Aframomum
an African genus of plants of the family Zingiberaceae
 
genus Afrocarpus
dioecious evergreen trees or shrubs; equatorial to southern and southeastern Africa: yellowwood; similar to trees or genus Podocarpus
 
genus Agalinis
semiparasitic herb with purple or white or pink flowers; grows in the United States and West Indies
 
genus Agapanthus
small genus of South African evergreen or deciduous plants; sometimes placed in the family or subfamily Alliaceae
 
genus Agaricus
type genus of Agaricaceae; gill fungi having brown spores and including several edible species
 
genus Agastache
giant hyssop; Mexican hyssop
 
genus Agathis
kauri pine
 
genus Agave
type genus of the Agavaceae; in some classifications considered a genus of Amaryllidaceae
 
genus Agdestis
a genus with one species that is a rapidly growing climbing vine with tuberous roots; grown in hot climates
 
genus Ageratina
annual to perennial herbs or shrubs of eastern United States and Central and South America
 
genus Ageratum
genus of tropical American herbs grown for their flowers
 
genus Aglaomorpha
epiphytic ferns of tropical Asia
 
genus Aglaonema
climbing herbs of southeastern Asia having thick fleshy oblong leaves and naked unisexual flowers: Chinese evergreen
 
genus Agrimonia
genus of herbs found chiefly in north temperate regions having pinnate leaves and yellow flowers followed by bristly fruit
 
genus Agropyron
perennial grasses of temperate and cool regions: wheatgrass; dog grass
 
genus Agrostemma
a caryophylloid dicot genus including corn cockles
 
genus Agrostis
annual or perennial grasses cosmopolitan in northern hemisphere: bent grass (so named from `bent' meaning an area of unfenced grassland)
 
genus Ailanthus
small genus of east Asian and Chinese trees with odd-pinnate leaves and long twisted samaras
 
genus Ajuga
bugle
 
genus Albatrellus
a genus of fungi belonging to the family Polyporaceae
 
genus Albizzia
large genus of unarmed trees and shrubs of Old World tropics
 
genus Albuca
genus of bulbous plants of South Africa; sometimes placed in subfamily Hyacinthaceae
 
genus Albugo
type genus of the Albuginaceae; fungi causing white rusts
 
genus Alcea
genus of erect herbs of the Middle East having showy flowers: hollyhocks; in some classification systems synonymous with genus Althaea
 
genus Aldrovanda
one species: waterwheel plant
 
genus Alectoria
lichens having dark brown erect or pendulous much-branched cylindrical thallus
 
genus Aletris
small genus of bitter-rooted herbs of eastern North America and Asia; sometimes placed in family Melanthiaceae
 
genus Aleurites
candlenut
 
genus Alisma
small genus of aquatic or semiaquatic plants
 
genus Allamanda
genus of tropical American woody vines
 
genus Alliaria
a genus of herbs of the family Cruciferae; have broad leaves and white flowers and long siliques
 
genus Allionia
small genus of chiefly American herbs
 
genus Allium
large genus of perennial and biennial pungent bulbous plants: garlic; leek; onion; chive; sometimes placed in family Alliaceae as the type genus
 
genus Alnus
alders
 
genus Alocasia
tropical Asiatic herbs similar to Colocasia but distinguished by a large sterile spadix
 
genus Aloe
large genus of chiefly African liliaceous plants; in some systems placed in family Aloeaceae
 
genus Alopecurus
annual or perennial grasses including decorative and meadow species as well as notorious agricultural weeds
 
genus Alsobia
tropical American herbs sometimes included in genus Episcia
 
genus Alstonia
genus of evergreen trees or shrubs with white funnel-shaped flowers and milky sap; tropical Africa to southeastern Asia and Polynesia
 
genus Alstroemeria
genus of showy South American herbs with leafy stems; sometimes placed in family Alstroemeriaceae or in family Amaryllidaceae
 
genus Alternanthera
genus of low herbs of tropical America and Australia; includes genus Telanthera
 
genus Althaea
hollyhocks; in some classification systems synonymous with genus Alcea
 
genus Alyssum
a genus of the family Cruciferae
 
genus Amanita
genus of widely distributed agarics that have white spores and are poisonous with few exceptions
 
genus Amaranthus
large widely distributed genus of chiefly coarse annual herbs
 
genus Amaryllis
type genus of the Amaryllidaceae; bulbous flowering plants of southern Africa
 
genus Amauropelta
epiphytic or terrestrial ferns of America and Africa and Polynesia
 
genus Amberboa
herbs of Mediterranean to central Asia cultivated for their flowers
 
genus Ambrosia
comprising the ragweeds; in some classification considered the type genus of a separate family Ambrosiaceae
 
genus Amelanchier
North American deciduous trees or shrubs
 
genus Amianthum
one species: fly poison; sometimes placed in family Melanthiaceae
 
genus Ammobium
small genus of Australian herbs grown for their flowers
 
genus Amorpha
American herbs or shrubs usually growing in dry sunny habitats on prairies and hillsides
 
genus Amorphophallus
genus of large tropical east Asian cormous aroids: devil's tongue; snake palm
 
genus Amphicarpaea
very small genus of twining vines of North America and Asia: hog peanut
 
genus Amsinckia
rough annual herbs of Europe and the Americas: fiddlenecks
 
genus Amsonia
genus of herbs and subshrubs with milky juice and showy bluish flowers; Europe to Asia Minor to Japan and North America
 
genus Amygdalus
used in former classifications for peach and almond trees which are now included in genus Prunus
 
genus Anacardium
type genus of the Anacardiaceae: cashew
 
genus Anacyclus
a Spanish pellitory
 
genus Anadenanthera
2 species of tropical American shrubs or trees
 
genus Anagallis
chiefly Old World herbs
 
genus Anagyris
very small genus of shrubs of southern Europe having backward curving seed pods
 
genus Ananas
a genus of tropical American plants have sword-shaped leaves and a fleshy compound fruits composed of the fruits of several flowers (such as pineapples)
 
genus Anaphalis
a genus of herbs of north temperate regions having hoary leaves: pearly everlasting
 
genus Anastatica
one species: rose of Jericho; resurrection plant
 
genus Anchusa
rough and hairy Old World herbs
 
genus Andira
small genus of evergreen trees of tropical America and western Africa
 
genus Andreaea
brown or blackish Alpine mosses having a dehiscent capsule with 4 longitudinal slits
 
genus Andromeda
low-growing shrubs of northern regions of northern hemisphere
 
genus Andropogon
tall annual or perennial grasses with spikelike racemes; warm regions
 
genus Andryala
a genus of hardy hairy latex-producing perennials of Mediterranean area
 
genus Anemia
genus of terrestrial or lithophytic ferns having pinnatifid fronds; chiefly of tropical America
 
genus Anemone
perennial herbs with tuberous roots and beautiful flowers; of north and south temperate regions
 
genus Anemonella
one species: rue anemone
 
genus Anemopsis
one species: yerba mansa
 
genus Anethum
dill
 
genus Angelica
biennial or perennial herbs of the northern hemisphere; have a taproot
 
genus Angiopteris
one species: tree fern
 
genus Angraecum
genus of tropical Old World epiphytic orchids with showy flowers sometimes grotesque
 
genus Anigozanthus
genus of monocotyledonous plants with curious woolly flowers on sturdy stems above a fan of sword-shaped leaves; includes kangaroo's paw and Australian sword lily; sometimes placed in family Amaryllidaceae
 
genus Annona
type genus of the Annonaceae; tropical American trees or shrubs
 
genus Anoectochilus
genus of delicate Asiatic orchids
 
genus Anogramma
a genus of ferns belonging to the family Pteridaceae
 
genus Antennaria
small woolly perennial herbs having small whitish discoid flowers surrounded by a ring of club-shaped bristles
 
genus Anthemis
dog fennel
 
genus Anthericum
genus of Old World (mainly African) perennial herbs; sometimes placed in family Asphodelaceae
 
genus Antheropeas
small genus of North American herbs often included in genus Eriophyllum
 
genus Anthoceros
hornworts
 
genus Anthriscus
chervil: of Europe, North Africa and Asia
 
genus Anthurium
large genus of often epiphytic evergreen tropical American plants often cultivated as houseplants
 
genus Anthyllis
genus of Mediterranean herbs and shrubs
 
genus Antirrhinum
a genus of herbs of the family Scrophulariaceae with brightly colored irregular flowers
 
genus Aphyllanthes
one species; small fibrous-rooted perennial with rushlike foliage and deep blue flowers; sometimes placed in its own family Aphyllanthaceae
 
genus Apios
twining perennial North American plants
 
genus Apium
celery
 
genus Aplectrum
a monocotyledonous genus of the family Orchidaceae
 
genus Apocynum
perennial herbs with small pink or white flowers
 
genus Aporocactus
small genus of epiphytic cacti of Mexico
 
genus Aquilegia
columbine
 
genus Arabidopsis
a genus of the mustard family having white or yellow or purplish flowers; closely related to genus Arabis
 
genus Arabis
annual to perennial woody herbs of temperate North America, Europe and Asia: rockcress
 
genus Arachis
a genus of plants with pods that ripen underground (see peanut)
 
genus Aralia
type genus of Araliaceae; large widely distributed genus of shrubs and trees and vines: spikenard; Hercules'-club
 
genus Araucaria
a genus of the araucaria family
 
genus Araujia
small genus of South American evergreen vines
 
genus Arbutus
large evergreen shrubs and trees of southern Europe and western North America: strawberry tree; madrona
 
genus Arceuthobium
genus of chiefly American plants parasitic on conifers
 
genus Arctium
burdock
 
genus Arctostaphylos
bearberry; manzanita
 
genus Arctotis
herbs and subshrubs: African daisy
 
genus Ardisia
tropical evergreen subshrubs (some climbers) to trees of Asia and Australasia to Americas
 
genus Areca
a monocotyledonous genus of palm trees
 
genus Arenaria
sandworts
 
genus Arenga
a genus of tropical Asian and Malaysian palm trees
 
genus Arethusa
genus of bog orchids of North America and Japan
 
genus Argemone
prickly poppies
 
genus Argyranthemum
comprises plants often included in the genus Chrysanthemum
 
genus Argyreia
woody climbers of tropical Asia to Australia
 
genus Argyroxiphium
small genus of Hawaiian spreading and rosette-forming shrubs
 
genus Ariocarpus
slow-growing geophytic cacti; northern and eastern Mexico; southern Texas
 
genus Arisaema
tuberous or rhizomatous herbaceous perennials
 
genus Arisarum
tuberous or rhizomatous perennial herbs; mainly Mediterranean area
 
genus Aristolochia
birthworts; Dutchman's-pipe
 
genus Aristotelia
small genus of shrubs or small trees of Australia and New Zealand and western South America
 
genus Armeria
shrubby or herbaceous low-growing evergreen perennials
 
genus Armillaria
genus of edible mushrooms having white spores an annulus and blue juice; some are edible; some cause root rot
 
genus Armillariella
a honey-colored diminutive form of genus Armillaria; grows in clusters; edible (when cooked) but most attention has been on how to get rid of it
 
genus Armoracia
horseradish
 
genus Arnica
large genus of herbs of north temperate and Arctic regions
 
genus Arnoseris
lamb succory
 
genus Arrhenatherum
oat grass
 
genus Artemisia
usually aromatic shrubs or herbs of north temperate regions and South Africa and western South America: wormwood; sagebrush; mugwort; tarragon
 
genus Arthropteris
tropical and subtropical Old World epiphytic or lithophytic ferns
 
genus Artocarpus
evergreen Asiatic trees now grown through the tropics: breadfruit; jackfruit
 
genus Arum
type genus of the Araceae: tuberous perennial herbs of Europe and Asia with usually heart-shaped leaves
 
genus Arundinaria
North American bamboo
 
genus Arundo
any of several coarse tall perennial grasses of most warm areas: reeds
 
genus Asarum
wild ginger
 
genus Asclepias
genus of chiefly North American perennial herbs: silkweed; milkweed
 
genus Asimina
pawpaw
 
genus Aspalathus
genus of South African heathlike shrubs
 
genus Asparagus
large genus of Old World perennial herbs with erect or spreading or climbing stems and small scalelike leaves and inconspicuous flowers; sometimes placed in family Asparagaceae
 
genus Aspergillus
genus of common molds causing food spoilage and some pathogenic to plants and animals
 
genus Asperula
woodruff
 
genus Asphodeline
genus of rhizomatous perennial or biennial herbs with numerous sometimes fragrant flowers in long cylindrical racemes; Mediterranean region to Caucasus; sometimes placed in family Asphodelaceae
 
genus Asphodelus
small genus of tall striking annuals or perennials with grasslike foliage and flowers in dense racemes or panicles; Mediterranean to Himalayas; sometimes placed in family Asphodelaceae
 
genus Aspidistra
genus of eastern Asiatic herbs; sometimes placed in the family Convallariaceae
 
genus Asplenium
in some classification systems placed in family Polypodiaceae
 
genus Aster
large genus of herbs widely cultivated for their daisylike flowers
 
genus Astilbe
chiefly Asiatic perennials: spirea
 
genus Astragalus
large genus of annual or perennial herbs or shrubs of north temperate regions; largest genus in the family Leguminosae
 
genus Astrantia
a genus of Eurasian herbs of the family Umbelliferae with aromatic roots and palmate leaves and showy flowers
 
genus Astreus
a genus of fungi belonging to the family Geastraceae
 
genus Astroloma
evergreen shrubs of Australia and Tasmania
 
genus Astronium
a genus of dicotyledonous plants of the family Anacardiaceae
 
genus Athrotaxis
a genus of gymnosperm
 
genus Athyrium
temperate and tropical lady ferns; in some classifications placed in family Polypodiaceae or in the genus Asplenium
 
genus Atriplex
orach; saltbush
 
genus Atropa
belladonna
 
genus Attalea
unarmed feather palms of central and northern South America
 
genus Aucuba
hardy evergreen dioecious shrubs and small trees from Japan
 
genus Aureolaria
small genus of North American herbs often root-parasitic and bearing golden-yellow flowers; sometimes placed in genus Gerardia
 
genus Auricularia
type genus of the Auriculariaceae
 
genus Austrocedrus
one species; formerly included in genus Libocedrus
 
genus Austrotaxus
a gymnosperm genus having one species: New Caledonian yew
 
genus Avena
oats
 
genus Averrhoa
trees native to East Indies having pinnate leaves: carambolas
 
genus Avicennia
small genus of tropical shrubs or trees
 
genus Ayapana
genus of tropical American herbs sometimes included in genus Eupatorium
 
genus Azadirachta
genus of large important East Indian trees: neem trees
 
genus Azolla
a genus of fern sometimes placed in its own family Azollaceae
 
genus Baccharis
shrubs of western hemisphere often having honey-scented flowers followed by silky thistlelike heads of tiny fruits; often used for erosion control
 
genus Ballota
perennial herbs or subshrubs of especially Mediterranean area: black horehound
 
genus Balsamorhiza
genus of coarse western American herbs with large roots containing an aromatic balsam
 
genus Bambusa
tall tender clumping bamboos
 
genus Banksia
important genus of Australian evergreen shrubs or trees with alternate leathery leaves and yellowish flowers
 
genus Baphia
small genus of shrubs and lianas and trees of Africa and Madagascar
 
genus Baptisia
genus of North American plants with showy flowers and an inflated pod
 
genus Barbarea
biennial or perennial herbs of north temperate regions: winter cress
 
genus Bartle-Frere
a living fossil or so-called `green dinosaur'; genus or subfamily of primitive nut-bearing trees thought to have died out 50 million years ago; a single specimen found in 1994 on Mount Bartle Frere in eastern Australia; not yet officially named
 
genus Bassia
summer cypress
 
genus Batis
small genus of plants constituting the family Batidaceae: low straggling dioecious shrubs
 
genus Bauhinia
mountain ebony, orchid tree
 
genus Beaumontia
small genus of evergreen woody vines in the East Indies and Asia
 
genus Begonia
large genus of tropical succulent plants widely cultivated
 
genus Belamcanda
a monocotyledonous genus of the family Iridaceae
 
genus Bellis
daisy
 
genus Bennettitis
type of the Bennettitales
 
genus Benzoin
used in some classifications for the American spicebush and certain other plants often included in the genus Lindera
 
genus Berberis
large genus of shrubs of temperate zones of New and Old Worlds
 
genus Bergenia
genus of perennial spring-blooming rhizomatous herbs with thick evergreen leaves; eastern Asia
 
genus Berteroa
hoary alyssum
 
genus Bertholletia
brazil nut
 
genus Bessera
small genus of cormous perennials of Mexico; sometimes placed in family Alliaceae
 
genus Besseya
genus of North American spring wildflowers
 
genus Beta
beets
 
genus Betula
a genus of trees of the family Betulaceae (such as birches)
 
genus Bidens
bur marigolds
 
genus Bignonia
one species: cross vine
 
genus Biscutella
genus of Eurasian herbs and small shrubs: buckler mustard
 
genus Blandfordia
small genus of tuberous Australian perennial herbs
 
genus Blastocladia
a genus of fungi of the family Blastodiaceae
 
genus Blastomyces
genus of pathogenic yeastlike fungi
 
genus Blechnum
in some classification systems placed in family Polypodiaceae; terrestrial ferns of cosmopolitan distribution mainly in southern hemisphere: hard ferns
 
genus Blephilia
small genus of North American herbs: wood mints
 
genus Bletia
genus of tropical American terrestrial orchids with large purple or pink flowers
 
genus Bletilla
small genus of chiefly east Asiatic hardy terrestrial orchids similar to genus Bletia
 
genus Blighia
small genus of western African evergreen trees and shrubs bearing fleshy capsular three-seeded fruits edible when neither unripe nor overripe
 
genus Bloomeria
small genus of bulbous perennial herbs of southwestern United States and Mexico; sometimes placed in family Alliaceae
 
genus Bocconia
tropical American trees or shrubs closely related to genus Macleaya
 
genus Boehmeria
false nettle
 
genus Bolbitis
terrestrial or less than normally scandent ferns of tropical regions of northern hemisphere
 
genus Boletellus
a genus of fungi belonging to the family Boletaceae
 
genus Boletus
type genus of Boletaceae; genus of soft early-decaying pore fungi; some poisonous and some edible
 
genus Boltonia
genus of tall leafy perennial herbs of eastern America and eastern Asia having flowers that resemble asters
 
genus Bomarea
large genus of tropical American vines having showy often spotted umbellate flowers; sometimes placed in family Liliaceae especially subfamily Alstroemeriaceae
 
genus Bombax
trees of chiefly South America
 
genus Borago
perennial herbs of the Mediterranean region
 
genus Borassus
palmyra
 
genus Boswellia
genus of trees of North Africa and India that yield incense
 
genus Botrychium
grape fern; moonwort
 
genus Bougainvillaea
ornamental tropical woody vines
 
genus Bouteloua
forage grasses
 
genus Bowiea
small genus of tropical African perennial bulbous herbs with deciduous twining stems; sometimes placed in family Hyacinthaceae
 
genus Boykinia
genus of perennial rhizomatous herbs with flowers in panicles; North America; Japan
 
genus Brachychiton
Australian trees (usually with swollen trunks)
 
genus Brachycome
mostly Australian herbs having basal or alternate leaves and loosely corymbose flower heads
 
genus Brachystegia
small genus of tropical African timber trees having pale golden heartwood uniformly striped with dark brown or black:
 
genus Brasenia
alternatively, a member of the family Nymphaeaceae
 
genus Brassavola
genus of tropical American epiphytic or lithophytic rhizomatous orchids
 
genus Brassia
genus of tropical American epiphytic orchids having striking axillary racemes of yellow to green spiderlike flowers with long slender sepals and warty lips: spider orchids
 
genus Brassica
mustards: cabbages; cauliflowers; turnips; etc.
 
genus Brickelia
genus of herbs of southwestern America having usually creamy florets followed by one-seeded fruits in a prominent bristly sheath
 
genus Brodiaea
genus of western United States bulbous plants with basal leaves and variously colored flowers; sometimes placed in family Alliaceae
 
genus Bromus
a genus of grasses of the family Gramineae
 
genus Broussonetia
paper mulberry
 
genus Browallia
small genus of tropical South American annuals
 
genus Bruckenthalia
a genus containing only one species: spike heath
 
genus Brugmansia
includes some plants often placed in the genus Datura: angel's trumpets
 
genus Brunfelsia
genus of tropical American shrubs grown for their flowers followed by fleshy berrylike fruits
 
genus Brya
genus of prickly shrubs and small trees of the Caribbean region; source of a durable hardwood
 
genus Bryanthus
a genus allied to and once included in genus Phyllodoce
 
genus Bryonia
climbing perennial herbs: bryony
 
genus Bryum
type genus of the Bryaceae: mosses distinguished by mostly erect and tufted gametophytes and symmetrical short-necked capsules
 
genus Buchloe
buffalo grass
 
genus Buckleya
small genus of Asiatic and American parasitic shrubs
 
genus Buddleia
shrubs or trees of warm regions
 
genus Bulnesia
palo santo
 
genus Bumelia
deciduous or evergreen American shrubs small trees having very hard wood and milky latex
 
genus Buphthalmum
oxeye
 
genus Burmannia
type genus of the Burmanniaceae; slender herbs of warm regions with leaves resembling scales and flowers with a three-angled or three-winged perianth
 
genus Bursera
type genus of Burseraceae; tropical and subtropical American shrubs and trees some yielding timber and gum elemi
 
genus Butea
genus of East Indian trees or shrubs: dhak
 
genus Buxus
type genus of the Buxaceae
 
genus Cabomba
alternatively, a member of the family Nymphaeaceae; a small genus of American aquatic plants
 
genus Cacalia
genus of tall smooth herbs of forested mountains of Europe and Asia minor; in some classifications includes many plants usually placed in genus Emilia
 
genus Caesalpinia
small spiny tropical trees or shrubs; includes the small genus or subgenus Poinciana
 
genus Cajanus
erect densely branched shrubby perennials of Old World tropics; naturalized in other warm regions
 
genus Cakile
small genus of succulent annual herbs found on sandy shores of North America and Europe
 
genus Caladenia
terrestrial orchids of Australia to New Caledonia
 
genus Caladium
small genus of tropical South American tuberous perennials with large variously colored leaves
 
genus Calamagrostis
reed grass
 
genus Calamintha
calamint
 
genus Calamus
distinctive often spiny-stemmed palms found as climbers in tropical and subtropical forest
 
genus Calandrinia
large genus of low-growing herbs; widespread throughout tropical and warm temperate regions having usually basal leaves and panicles of purplish ephemeral flowers
 
genus Calanthe
large and widely distributed genus of terrestrial orchids
 
genus Calceolaria
large genus of tropical American herbs and shrubs with showy cymose flowers
 
genus Calendula
marigold
 
genus Calla
water arum
 
genus Calliandra
genus of pinnate-leaved shrubs and small trees of tropical and subtropical North and South America and India and West Africa
 
genus Callirhoe
small genus of North American herbs having usually red or purple flowers
 
genus Callistephus
one species: erect Asiatic herb with large flowers
 
genus Callitriche
water starworts
 
genus Callitris
evergreen monoecious coniferous trees or shrubs: cypress pines
 
genus Calluna
one species
 
genus Calocarpum
a genus of tropical American trees of the family Sapotaceae
 
genus Calocedrus
tall evergreens of western North America and eastern Asia; formerly included in genus Libocedrus
 
genus Calochortus
large genus of western North American leafy-stemmed bulbous herbs
 
genus Calophyllum
genus of tropical evergreen trees
 
genus Calopogon
terrestrial orchids of North America
 
genus Caltha
a genus of Caltha
 
genus Calvatia
genus of puffballs having outer casings whose upper parts break at maturity into angular pieces to expose the spores
 
genus Calycanthus
a magnoliid dicot genus of the family Calycanthaceae including: allspice
 
genus Calycophyllum
medium to large tropical American trees having shiny reddish-brown shredding bark
 
genus Calypso
one species found throughout much of northern North America and Eurasia
 
genus Calystegia
climbing or scrambling herbs: bindweed
 
genus Camelina
annual and biennial herbs of Mediterranean to central Asia
 
genus Camellia
tropical Asiatic evergreen shrubs or small trees
 
genus Campanula
large genus of herbs grown for their blossoms: bellflowers
 
genus Camptosorus
classification used in some especially former systems for plants usually placed in genus Asplenium
 
genus Campyloneurum
epiphytic ferns of tropical America
 
genus Canangium
a genus of Malayan tree
 
genus Canavalia
herbs or woody vines of mainly American tropics and subtropics
 
genus Candida
a genus of yeastlike imperfect fungi; sometimes included in genus Monilia of the family Moniliaceae
 
genus Canella
one species
 
genus Canna
type and sole genus of the Cannaceae: perennial lily-like herbs of New World tropics
 
genus Cannabis
hemp: genus of coarse annuals native to central Asia and widely naturalized in north temperate regions; in some classifications included in the family Moraceae
 
genus Cantharellus
a well-known genus of fungus; has funnel-shaped fruiting body; includes the chanterelles
 
genus Capparis
tropical or subtropical evergreen shrubs or small trees
 
genus Capsella
shepherd's purse
 
genus Capsicum
chiefly tropical perennial shrubby plants having many-seeded fruits: sweet and hot peppers
 
genus Caragana
large genus of Asiatic deciduous shrubs or small trees
 
genus Cardamine
bittercress, bitter cress
 
genus Cardiospermum
tendril-climbing herbs or shrubs whose seeds have a white heart-shaped spot
 
genus Carduus
genus of annual or perennial Old World prickly thistles
 
genus Carex
large genus of plants found in damp woodlands and bogs and ditches or at water margins: sedges
 
genus Carica
type genus of the Caricaceae; tropical American trees: papayas
 
genus Carissa
Old World genus of tropical evergreen usually spiny shrubs
 
genus Carlina
genus of Mediterranean thistles
 
genus Carnegiea
caryophylloid dicot genus with only one species: saguaro
 
genus Carpenteria
one species; sometimes placed in family Saxifragaceae
 
genus Carpinus
mostly deciduous monoecious trees or shrubs: hornbeams; sometimes placed in subfamily Carpinaceae
 
genus Carpobrotus
a caryophyllaceous genus of Carpobrotus
 
genus Carthamus
safflower
 
genus Carum
caraway
 
genus Carya
genus of large deciduous nut-bearing trees; United States and China
 
genus Caryocar
type genus of the Caryocaraceae; South American trees yielding strong fine-grained wood and edible nuts
 
genus Caryota
fishtail palms
 
genus Cassia
some genus Cassia species often classified as members of the genus Senna or genus Chamaecrista
 
genus Cassiope
low tufted evergreen shrubs of colder parts of north temperate regions having moss-like foliage and nodding white or pink flowers
 
genus Castanea
chestnuts; chinkapins
 
genus Castanopsis
evergreen trees and shrubs of warm regions valued for their foliage; southeastern United States and eastern Australia and northern New Zealand
 
genus Castanospermum
a rosid dicot genus of the subfamily Papilionoideae having one species: Moreton Bay chestnut
 
genus Castilleia
genus of western North and South American perennials often partially parasitic on roots of grasses
 
genus Casuarina
genus of trees and shrubs widely naturalized in southern United States and West Indies; coextensive with the family Casuarinaceae and order Casuarinales
 
genus Catalpa
a dicotyledonous genus of plants belonging to the family Bignoniaceae; has large flowers (white or mottled) and long terete pods
 
genus Catananche
genus of Mediterranean herbs: cupid's dart
 
genus Catasetum
genus of tropical American orchids having showy male and female flowers usually on separate inflorescences
 
genus Catha
a genus of African evergreen shrubs characterized by thick leaves and white flowers
 
genus Catharanthus
small genus of erect annual or perennial herbs native to Madagascar; widely naturalized in the tropics; formerly included in genus Vinca
 
genus Cathaya
one species; related to Pseudotsuga and Larix
 
genus Cattleya
large and highly valued genus of beautiful tropical American epiphytic or lithophytic orchids; the typical orchids; known in many varieties
 
genus Caulophyllum
blue cohosh
 
genus Cecropia
large genus of tropical American trees that yield a bast fiber used for cordage and bark used in tanning; milky juice yields caoutchouc
 
genus Cedrela
tropical American trees
 
genus Cedrus
true cedars
 
genus Ceiba
tropical American trees with palmately compound leaves and showy bell-shaped flowers
 
genus Celastrus
genus of woody vines and erect shrubs (type genus of the Celastraceae) that is native chiefly to Asia and Australia: includes bittersweet
 
genus Celosia
annual or perennial herbs or vines of tropical and subtropical America and Asia and Africa
 
genus Celtis
large genus of trees and shrubs with berrylike fruit
 
genus Cenchrus
a genus of grasses of the family Gramineae that have burs
 
genus Centaurea
knapweed; star thistle
 
genus Centaurium
genus of low-growing herbs mostly of northern hemisphere having flowers with protruding spirally twisted anthers
 
genus Centranthus
genus of southern European herbs and subshrubs
 
genus Centrolobium
a genus of Centrolobium
 
genus Centrosema
a genus of chiefly tropical American vines of the family Leguminosae having trifoliate leaves and large flowers
 
genus Centunculus
a dicotyledonous genus of the family Primulaceae
 
genus Cephalanthera
small genus of temperate Old World terrestrial orchids
 
genus Cephalotaxus
the genus of Cephalotaxus (see plum-yews)
 
genus Cephalotus
one species: Australian pitcher plant
 
genus Cerastium
mouse-eared chickweed
 
genus Ceratonia
carobs
 
genus Ceratopetalum
a dicotyledonous genus of the family Cunoniaceae
 
genus Ceratophyllum
constituting the family Ceratophyllaceae: hornworts
 
genus Ceratopteris
water ferns
 
genus Ceratostomella
genus of fungi forming continuous hyaline spores
 
genus Ceratozamia
small genus of Mexican cycads; sometimes classified in family Cycadaceae
 
genus Cercidiphyllum
one species: katsura tree
 
genus Cercidium
spiny shrubs or small trees sometimes placed in genus Parkinsonia: paloverde
 
genus Cercis
deciduous shrubs and trees of eastern Asia, southern Europe and the United States
 
genus Cercospora
form genus of imperfect fungi that are leaf parasites with long slender spores
 
genus Cercosporella
form genus of imperfect fungi lacking pigment in the spores and conidiophores
 
genus Cereus
genus of much-branched treelike or shrubby cacti with pronounced ribs and rounded needlelike spines and nocturnal flowers usually white
 
genus Ceroxylon
wax palms
 
genus Cestrum
genus of fragrant tropical American shrubs
 
genus Ceterach
small genus of Old World ferns; superseded in some classification systems which place plants of this genus in e.g. genera Asplenium and Pleurosorus
 
genus Cetraria
foliose lichens chiefly of northern latitudes
 
genus Chaenactis
genus of flowering herbs of western United States
 
genus Chaenomeles
flowering quince
 
genus Chamaecrista
genus of tropical herbs or subshrubs having sensitive leaves and suddenly dehiscing pods; some species placed in genus Cassia
 
genus Chamaecyparis
a genus of Chamaecyparis
 
genus Chamaecytisus
small late-flowering trees or subshrubs having yellow to red flowers and leathery or woody pods; often especially formerly included in genus Cytisus
 
genus Chamaedaphne
one species: leatherleaf
 
genus Chamaemelum
small genus of plants sometimes included in genus Anthemis: chamomile
 
genus Cheilanthes
small evergreen ferns: lipferns; in some classifications placed in family Polypodiaceae or Adiantaceae
 
genus Cheiranthus
Old World perennial plants grown for their showy flowers
 
genus Chelidonium
one species: greater celandine
 
genus Chelone
herbaceous perennials: shellflower
 
genus Chenopodium
goosefoot; pigweed
 
genus Chilopsis
one species: desert willow
 
genus Chimaphila
small genus of evergreen herbs with long creeping rootstocks and shining leaves; North America; Europe; east Asia
 
genus Chimonanthus
small genus of Asian deciduous or evergreen shrubs having fragrant flowers: winter sweet
 
genus Chinchona
large genus of trees of Andean region of South America having medicinal bark
 
genus Chiococca
shrubs of tropical and subtropical New World
 
genus Chionanthus
deciduous trees or shrubs: fringe tree
 
genus Chloranthus
type genus of the Chloranthaceae
 
genus Chloris
tufted or perennial or annual grasses having runners: finger grass; windmill grass
 
genus Chlorophyllum
a genus of fungus belonging to the family Lepiotaceae
 
genus Chloroxylon
deciduous trees of India and Sri Lanka
 
genus Chordospartium
2 species of small New Zealand trees: weeping tree broom; endangered
 
genus Chorizema
genus of Australian twining vines and small shrubs: flame peas
 
genus Christella
medium to large terrestrial ferns of tropical forests of Old World to Americas
 
genus Chrysanthemum
in some classifications many plants usually assigned to the genus Chrysanthemum have been divided among other genera: e.g. Argyranthemum; Dendranthema; Leucanthemum; Tanacetum
 
genus Chrysobalanus
coco plums
 
genus Chrysolepis
two species: golden chinkapins
 
genus Chrysophyllum
tropical American evergreen trees or shrubs
 
genus Chrysopsis
golden aster
 
genus Chrysosplenium
genus of widely distributed semiaquatic herbs with minute greenish-yellow apetalous flowers
 
genus Chrysothamnus
genus of low branching shrubs of western North America
 
genus Cibotium
in some classification systems placed in family Cyatheaceae: ornamental tree ferns with coarse gracefully drooping fronds
 
genus Cicer
chickpea plant; Asiatic herbs
 
genus Cichorium
chicory
 
genus Cicuta
small genus of perennial herbs having deadly poisonous tuberous roots: water hemlock
 
genus Cimicifuga
small genus of perennial herbs of north temperate regions: bugbane
 
genus Cinnamomum
Asiatic and Australian aromatic trees and shrubs
 
genus Circaea
enchanter's nightshade
 
genus Cirsium
plume thistles
 
genus Cistus
small to medium-sized evergreen shrubs of southern Europe and North Africa
 
genus Citroncirus
a cross between Citrus sinensis and Poncirus trifoliata
 
genus Citrullus
a dicot genus of the family Cucurbitaceae including watermelons
 
genus Citrus
orange; lemon; lime; etc.
 
genus Cladonia
type genus of Cladoniaceae; lichens characterized by a crustose thallus and capitate fruiting bodies borne on simple or branched podetia
 
genus Cladrastis
yellowwoods
 
genus Clathrus
type genus of the Clathraceae
 
genus Claviceps
fungi parasitic upon the ovaries of various grasses
 
genus Claytonia
genus of mainly North American succulent herbs with white or pink flowers usually in terminal racemes
 
genus Cleistes
terrestrial orchids of North and South America having slender fibrous roots; allied to genus Pogonia
 
genus Clematis
large genus of deciduous or evergreen woody vines or erect herbs
 
genus Cleome
tropical and subtropical annual or perennial herbs or low shrubs
 
genus Clethra
type and sole genus of the Clethraceae; deciduous shrubs or small trees: white alder, summer-sweet
 
genus Clianthus
genus of semi-prostrate Australasian shrubs or vines
 
genus Cliftonia
one species: titi
 
genus Clinopodium
wild basil
 
genus Clintonia
sometimes placed in family Convallariaceae
 
genus Clitocybe
a genus of agarics with white to pale yellow spore deposits and fleshy stalks centrally attached to the cap and closely attached gills
 
genus Clitoria
genus of tropical shrubs or vines having pinnate leaves and large axillary flowers
 
genus Clusia
tropical American aromatic trees or shrubs; often epiphytic; some stranglers
 
genus Cnicus
one species: blessed thistle
 
genus Cnidoscolus
a genus of perennial plant with bristles; belonging to the family Euphorbiaceae
 
genus Cocculus
climbing plants or shrubs
 
genus Cochlearia
a genus of the family Cruciferae
 
genus Cocos
coconut palms
 
genus Codariocalyx
used in some classifications for plants usually included in genus Desmodium
 
genus Codiaeum
evergreen tropical trees and shrubs with thick and colorful leathery leaves; Malaya and Pacific islands
 
genus Coeloglossum
terrestrial orchids of cooler parts of North America and Europe: satyr orchid
 
genus Coelogyne
large diverse genus of tropical Asiatic epiphytic orchids
 
genus Coffea
coffee trees
 
genus Cola
large genus of African trees bearing kola nuts
 
genus Colchicum
chiefly fall-blooming perennial cormous herbs; sometimes placed in family Colchicaceae
 
genus Coleus
genus of Old World tropical plants cultivated for their variegated leaves; various plants sometimes placed in genera Plectranthus or Solenostemon
 
genus Collinsia
genus of hardy annual herbs of western United States
 
genus Collinsonia
small genus of perennial erect or spreading aromatic herbs; United States
 
genus Colocasia
small genus of perennial tuberous herbs of tropical Asia: taro
 
genus Colubrina
mostly tropical American shrubs or small trees with small yellowish flowers and yellow or red fruits
 
genus Columnea
genus of tropical American subshrubs and lianas
 
genus Colutea
small genus of Eurasian shrubs with yellow flowers and bladdery pods
 
genus Comandra
small genus of chiefly North American parasitic plants
 
genus Combretum
type genus of the Combretaceae: tropical and subtropical small shrubs and trees
 
genus Commelina
type genus of the Commelinaceae; large genus of herbs of branching or creeping habit: day flower; widow's tears
 
genus Commiphora
genus of East Indian and African trees yielding balsamic products
 
genus Comptonia
one species: sweet fern
 
genus Coniogramme
terrestrial ferns of Pacific islands and Asia
 
genus Conium
small genus of highly toxic biennials: hemlock
 
genus Connarus
large genus of tropical trees and shrubs; type genus of the Connaraceae
 
genus Conocarpus
monotypic genus of tropical American trees: button tree
 
genus Conoclinium
mistflower
 
genus Conopodium
a genus of dicotyledonous plants of the family Umbelliferae
 
genus Conospermum
Australian shrubs (some trees) with flowers in dense spikes: smoke bush
 
genus Conradina
small genus of low aromatic shrubs of southeastern United States
 
genus Consolida
plants having flowers resembling the larkspur's but differing from larkspur's in the arrangement of petals; sometimes included in genus Delphinium
 
genus Convallaria
sometimes placed in family Convallariaceae: lily of the valley
 
genus Convolvulus
genus of mostly climbing or scrambling herbs and shrubs: bindweed
 
genus Conyza
common American weed or wildflower
 
genus Copernicia
slow-growing tropical fan palms
 
genus Coprinus
genus of black-spotted agarics in which the cap breaks down at maturity into an inky fluid; sometimes placed in its own family Coprinaceae
 
genus Coptis
small genus of low perennial herbs having yellow rhizomes and white or yellow flowers
 
genus Corallorhiza
genus of leafless root-parasitic orchids having small purplish or yellowish racemose flowers with lobed lips; widely distributed in temperate regions
 
genus Corchorus
widely distributed genus of tropical herbs or subshrubs; especially Asia
 
genus Cordaites
tall Paleozoic trees superficially resembling modern screw pines; structurally intermediate in some ways between cycads and conifers
 
genus Cordia
tropical deciduous or evergreen trees or shrubs of the family Boraginaceae
 
genus Cordyline
Asiatic and Pacific trees or shrubs; fragments of the trunk will regrow to form whole plants
 
genus Coreopsis
genus of American plants widely cultivated for their flowers
 
genus Coriandrum
small genus of annual Mediterranean herbs
 
genus Cornus
a rosid dicot genus of the family Cornaceae including: dogwood; cornel: perennial chiefly deciduous shrubs or small trees of temperate regions of northern hemisphere
 
genus Corokia
evergreen shrubs with intricately twisted wiry stems that in summer are smothered in small yellow flowers; grows in New Zealand
 
genus Coronilla
genus of Old World shrubs and herbs
 
genus Corozo
a monocotyledonous genus of tropical American palm trees
 
genus Cortaderia
tall ornamental grasses of South America and New Zealand and New Guinea: pampas grass
 
genus Corticium
genus of fungi having simple smooth sporophores; some are parasitic on wood or economic crops; some species formerly placed in form genus Rhizoctinia
 
genus Cortinarius
the largest genus in the Agaricales; agarics having rusty spores and prominent cortinae (cobwebby partial veils)
 
genus Coryanthes
small genus of tropical American epiphytic or lithophytic orchids
 
genus Corydalis
annual or perennial herbs of Himalayan China and South Africa
 
genus Corylopsis
small genus of deciduous shrubs of temperate regions of Asia
 
genus Corylus
deciduous monoecious nut-bearing shrubs of small trees: hazel; sometimes placed in the subfamily or family Corylaceae
 
genus Corypha
large fan palms of tropical Asia to Australia
 
genus Coryphantha
mainly globose cacti of southwestern United States and Mexico covered with many nodules; superficially resembling and formerly included in genus Mammillaria
 
genus Cosmos
genus of tropical American plants cultivated for their colorful flowers
 
genus Cotinus
smoke trees
 
genus Cotoneaster
genus of deciduous or evergreen Old World shrubs widely cultivated
 
genus Cotula
cosmopolitan herbs especially southern hemisphere; many used as ground covers
 
genus Coumarouna
tropical American trees: tonka beans
 
genus Crambe
annual or perennial herbs with large leaves that resemble the leaves of cabbages
 
genus Craspedia
herbs of Australia and New Zealand
 
genus Crassula
type genus of Crassulaceae; herbs and small shrubs having woody stems and succulent aerial parts
 
genus Crataegus
thorny shrubs and small trees: hawthorn; thorn; thorn apple
 
genus Crateva
tropical genus of small trees or shrubs
 
genus Crepis
hawk's-beard; cosmopolitan in northern hemisphere
 
genus Crescentia
a genus of tropical American trees of the family Bignoniaceae; has a short trunk and crooked limbs and drooping branches
 
genus Crocus
a monocotyledonous genus of the family Iridaceae
 
genus Cronartium
rust fungi having aecia produced in raised or swollen sori and teliospores borne in waxy columns
 
genus Crotalaria
large genus of herbs with simple leaves and racemes of yellow flowers; mainly of tropical Africa
 
genus Croton
tropical shrubs and herbs; source of croton oil
 
genus Cryptocoryne
water trumpet; aquatic herbs having broad leaves and long slender spathes; often used as aquarium plants
 
genus Cryptogramma
sometimes placed in family Polypodiaceae or Cryptogrammataceae
 
genus Cryptomeria
Japanese cedar; sugi
 
genus Cucumis
cucumbers; muskmelons
 
genus Cucurbita
type genus of the Cucurbitaceae
 
genus Culcita
includes some plants usually placed in e.g. genus Dicksonia: terrestrial ferns resembling bracken; tropical America; Malaysia to Australia and Polynesia; southwestern Europe and Atlantic islands
 
genus Cuminum
cumin
 
genus Cupressus
type genus of Cupressaceae
 
genus Curcuma
tropical Asiatic perennial herbs
 
genus Curtisia
a large evergreen tree of South Africa
 
genus Cuscuta
genus of twining leafless parasitic herbs lacking chlorophyll: dodder
 
genus Cyamopsis
small genus of annual usually hairy herbs of tropical Africa and Arabia
 
genus Cyathea
type genus of the Cyatheaceae: tree ferns of the tropical rain forest to temperate woodlands
 
genus Cycas
type genus of Cycadaceae: genus of widely distributed Old World evergreen tropical trees having pinnate leaves and columnar stems covered with persistent bases of old leaves
 
genus Cyclamen
genus of widely cultivated flowering Eurasian herbs with centrally depressed rounded tubers and rounded heart-shaped leaves
 
genus Cycloloma
a caryophyllaceous genus of the family Chenopodiaceae
 
genus Cyclophorus
tropical Old World ferns having closely crowded circular sori and no indusia
 
genus Cyclosorus
small genus of terrestrial ferns of tropical and subtropical southern hemisphere
 
genus Cycnoches
genus of epiphytic or terrestrial tropical American orchids
 
genus Cydonia
quince
 
genus Cymbidium
genus of tropical epiphytic or terrestrial Old World orchids; one of the most popular orchid genera
 
genus Cynancum
genus of perennial tropical African lianas
 
genus Cynara
artichoke; cardoon
 
genus Cynodon
creeping perennial grasses of tropical and southern Africa
 
genus Cynoglossum
a large genus of tall rough herbs belonging to the family Boraginaceae
 
genus Cyperus
type genus of Cyperaceae; grasslike rhizomatous herbs; cosmopolitan except very cold regions
 
genus Cyphomandra
tree tomato
 
genus Cypripedium
genus of chiefly American perennial leafy-stemmed orchids: lady's slippers; sometimes includes species of genus Paphiopedilum
 
genus Cyrilla
one species: trees and shrubs having flowers with acute or twisted petals and wingless fruit
 
genus Cyrtomium
small genus of tropical Asiatic greenhouse ferns; in some classifications placed in Polypodiaceae
 
genus Cystopteris
chiefly small perennial rock ferns: bladder ferns; in some classifications placed in Polypodiaceae
 
genus Cytisus
large genus of stiff or spiny evergreen or deciduous Old World shrubs: broom
 
genus Daboecia
a dicotyledonous genus of the family Ericaceae
 
genus Dacrycarpus
evergreen coniferous shrubs or trees of New Zealand to Malaysia and Philippines
 
genus Dacrydium
Australasian evergreen trees or shrubs
 
genus Dacrymyces
type genus of the Dacrymycetaceae: fungi with a bifurcate basidium that lacks septa
 
genus Dactylis
a monocotyledonous grass of the family Gramineae (has only one species)
 
genus Dactyloctenium
a monocotyledonous genus of the family Gramineae
 
genus Dactylorhiza
genus of terrestrial orchids of Europe and Asia and North Africa
 
genus Dahlia
genus of perennial tuberous plants of Mexico and Central America
 
genus Dalbergia
large genus of tropical trees having pinnate leaves and paniculate flowers and cultivated commercially for their dramatically grained and colored timbers
 
genus Dalea
indigo bush
 
genus Danaea
fairly small terrestrial ferns of tropical America
 
genus Daphne
usually evergreen Eurasian shrubs
 
genus Darlingtonia
one species: California pitcher plant
 
genus Datura
thorn apple
 
genus Daucus
carrot
 
genus Davallia
Old World tropical fern; in some classification systems placed directly in family Polypodiaceae
 
genus Daviesia
genus of Australasian shrubs and subshrubs having small yellow or purple flowers followed by short triangular pods
 
genus Decumaria
small genus of woody climbers with adhesive aerial roots; sometimes placed in family Saxifragaceae
 
genus Delairea
one species: German ivy
 
genus Delonix
evergreen or deciduous trees of tropical Africa and India
 
genus Delphinium
large genus of chiefly perennial erect branching herbs of north temperate regions some poisonous
 
genus Dendranthema
comprises plants often included in the genus Chrysanthemum
 
genus Dendrobium
large genus and variable genus of chiefly epiphytic or lithophytic orchids of tropical and subtropical Asia and Australasia
 
genus Dendrocalamus
giant clump-forming bamboos
 
genus Dendromecon
one species: bush poppy
 
genus Dennstaedtia
chiefly terrestrial ferns; in some classification systems placed in family Polypodiaceae
 
genus Dentaria
usually included in genus Cardamine; in some classifications considered a separate genus
 
genus Deparia
classification used for 5 species of terrestrial ferns usually placed in other genera
 
genus Derris
genus of Old World tropical shrubs and woody vines
 
genus Descurainia
includes annual or biennial herbs of America and Europe very similar to and often included among those of genera Sisymbrium or Hugueninia; not recognized in some classification systems
 
genus Desmanthus
genus of American herbs or shrubs with sensitive pinnate leaves and small whitish flowers
 
genus Desmodium
beggarweed; tick trefoil
 
genus Deutzia
genus of ornamental mostly deciduous shrubs native to Asia and Central America; widespread in cultivation; sometimes placed in family Saxifragaceae
 
genus Diacalpa
one species: delicate fern of foothills of Himalayas
 
genus Dianthus
carnations and pinks
 
genus Diapensia
type genus of Diapensiaceae
 
genus Dicentra
North American and Asian herbs with divided leaves and irregular flowers
 
genus Dichondra
genus of chiefly tropical prostrate perennial herbs with creeping stems that root at the nodes
 
genus Dicksonia
tree ferns of temperate Australasia having bipinnatifid or tripinnatifid fronds and usually marginal sori; in some classification systems placed in family Cyatheaceae
 
genus Dicranopteris
terrestrial ferns of forest margin or open ground; pantropical
 
genus Dicranum
type genus of Dicranaceae
 
genus Dictamnus
a dicotyledonous genus of the family Rutaceae
 
genus Dictostylium
genus of slime molds that grow on dung and decaying vegetation
 
genus Dictyophera
closely related to genus Phallus distinguished by an indusium hanging like a skirt from below the pileus
 
genus Dieffenbachia
evergreen perennial herbs of tropical America with lush foliage and poisonous sap; often cultivated as houseplants
 
genus Diervilla
small genus of low deciduous shrubs: bush honeysuckles
 
genus Digitalis
genus of Eurasian herbs having alternate leaves and racemes of showy bell-shaped flowers
 
genus Digitaria
crab grass; finger grass
 
genus Dillenia
East Indian and Australian shrubs and trees having panicles of large white or yellow flowers
 
genus Dimocarpus
longan
 
genus Dimorphotheca
South African herbs or subshrubs with usually yellow flowers
 
genus Dionaea
a genus of the family Droseraceae
 
genus Dioon
small genus of arborescent cycads of Mexico and Central America; sometimes classified in family Cycadaceae
 
genus Dioscorea
yams
 
genus Diospyros
a genus of trees or shrubs that have beautiful and valuable wood
 
genus Dipladenia
genus of tropical South American tuberous perennial woody vines with large racemose flowers and milky sap
 
genus Diplopterygium
scandent thicket-forming ferns of Asia to western Pacific
 
genus Diplotaxis
wall rocket
 
genus Dipogon
one species: Australian pea
 
genus Dipsacus
type genus of the Dipsacaceae: teasel
 
genus Dipteronia
small genus of large deciduous shrubs having large clusters of winged seeds that turn red as they mature; central and southern China
 
genus Dirca
deciduous shrub of North America: leatherwood
 
genus Disa
genus of showy tropical African terrestrial orchids
 
genus Discina
a genus of fungi of the family Helvellaceae with a cup-shaped or saucer-shaped fruiting body and ornamented spores
 
genus Dodonaea
a genus of tropical shrub or tree
 
genus Dolichos
genus of chiefly tropical vines often placed in genera Dipogon or Lablab or Macrotyloma
 
genus Dombeya
genus of African shrubs or small trees
 
genus Doodia
in some classification systems placed in family Polypodiaceae; small terrestrial colony-forming ferns of Australasia
 
genus Doronicum
genus of Eurasian perennial tuberous or rhizomatous herbs: leopard's bane
 
genus Dorotheanthus
a caryophyllaceous genus of Dorotheanthus
 
genus Doryopteris
small to medium tropical tufted ferns; sometimes placed in family Adiantaceae
 
genus Dovyalis
small genus of sometimes spiny shrubs or small trees; Africa; India; Sri Lanka
 
genus Draba
large genus of low tufted herbs of temperate and Arctic regions
 
genus Dracaena
Old World tropical plants with branches ending in tufts of sword-shaped leaves; in some classifications considered a genus of Liliaceae
 
genus Dracocephalum
genus of American herbs and dwarf shrubs of the mint family: dragonheads
 
genus Dracontium
small genus of tropical American cormous herbs
 
genus Dracula
comprises tropical American species usually placed in genus Masdevallia: diminutive plants having bizarre and often sinister-looking flowers with pendulous scapes and motile lips
 
genus Dracunculus
tuberous herbaceous perennials: dragon arum
 
genus Drimys
shrubs and trees of southern hemisphere having aromatic foliage
 
genus Drosera
the type genus of Droseraceae including many low bog-inhabiting insectivorous plants
 
genus Drosophyllum
one species
 
genus Dryadella
comprises tropical American species usually placed in genus Masdevallia: very dwarf plants having short tufted and usually unifoliate stems with usually solitary flowers
 
genus Dryas
mountain avens
 
genus Drymoglossum
epiphytic ferns of Madagascar to tropical Asia and New Guinea
 
genus Drynaria
large robust epiphytic ferns of tropical forest and scrub; Africa and Asia and Australia
 
genus Dryopteris
large widespread genus of medium-sized terrestrial ferns; in some classification systems placed in Polypodiaceae
 
genus Drypis
one species
 
genus Durio
a genus of tall Asian trees of the family Bombacaceae
 
genus Eburophyton
a monocotyledonous genus of the family Orchidaceae
 
genus Ecballium
exploding cucumber; squirting cucumber
 
genus Echinacea
small genus of North American coarse perennial herbs
 
genus Echinocactus
globular or cylindrical cacti; southwestern United States to Brazil
 
genus Echinocereus
large genus of low-growing shrubby ribbed cacti of Mexico and southwestern United States
 
genus Echinochloa
annual or perennial succulent grasses of warm regions
 
genus Echinops
genus of Mediterranean and Eurasian herbs: globe thistles
 
genus Echium
a genus of bristly herbs and shrubs of the family Boraginaceae
 
genus Egeria
small genus of dioecious tropical aquatic plants
 
genus Eichhornia
water hyacinth; water orchid
 
genus Elaeagnus
oleaster
 
genus Elaeis
oil palms
 
genus Elaeocarpus
type genus of the family Elaeocarpaceae
 
genus Eleocharis
sedges having dense spikes of flowers and leaves reduced to basal sheaths
 
genus Elephantopus
perennial American herb
 
genus Elettaria
cardamom
 
genus Eleusine
annual and perennial grasses of savannas and upland grasslands
 
genus Elodea
submerged freshwater perennials
 
genus Elsholtzia
genus of Asiatic and African aromatic herbs
 
genus Elymus
tall tufted perennial grasses (such as lyme grass or wild rye)
 
genus Embothrium
small genus of South American evergreen shrubs or small trees with long willowy branches and flowers in flamboyant terminal clusters
 
genus Emilia
tropical African herbs
 
genus Emmanthe
one species: yellow bells
 
genus Empetrum
crowberries
 
genus Encelia
genus of shrubs of southwestern United States and Mexico: brittlebush
 
genus Enceliopsis
small genus of xerophytic herbs of southwestern United States
 
genus Encephalartos
genus of arborescent African cycads; sometimes classified in family Cycadaceae
 
genus Encyclia
large genus of epiphytic and lithophytic orchids of tropical and subtropical Americas and West Indies; formerly included in genus Epidendrum
 
genus Engelmannia
one species: North American herbs that resemble sunflowers
 
genus Ensete
Old World tropical herbs: Abyssinian bananas
 
genus Entandrophragma
cedar mahogany trees
 
genus Entelea
a genus of evergreen shrub that grows in New Zealand
 
genus Enterolobium
small genus of tropical American timber trees closely allied to genus Albizia
 
genus Entoloma
agarics with pink spores but lacking both volva and annulus (includes some that are poisonous)
 
genus Entomophthora
type genus of the Entomophthoraceae; fungi parasitic on insects
 
genus Epacris
type genus of the Epacridaceae: Australian heath
 
genus Ephedra
type and sole genus of Ephedraceae: tropical and subtropical evergreen shrubby or creeping plants native to dry and inhospitable regions
 
genus Epidendrum
large and variable genus of terrestrial or epiphytic or lithophytic orchids of tropical and subtropical Americas; some native to United States
 
genus Epigaea
small creeping evergreen shrubs: trailing arbutus
 
genus Epilobium
large widely distributed genus of herbs and subshrubs of especially western North America and Arctic areas
 
genus Epimedium
herbaceous perennials of Mediterranean to India and eastern Asia
 
genus Epipactis
genus of hardy orchids with leafy-bracted racemes of greenish or purplish irregular flowers
 
genus Epiphyllum
small genus of tropical American (mainly Central America) cacti
 
genus Epipremnum
small genus of evergreen lianas of southeastern Asia to western Pacific areas
 
genus Episcia
genus of tropical American herbs having soft hairy foliage
 
genus Equisetum
horsetails; coextensive with the family Equisetaceae
 
genus Eragrostis
annual or perennial grasses of tropics and subtropics
 
genus Eranthis
winter aconite
 
genus Ercilla
a genus of evergreen climbers
 
genus Erechtites
coarse herbs with whitish discoid flower heads and silky pappus
 
genus Erianthus
genus of reedlike grasses having spikes crowded in a panicle covered with long silky hairs
 
genus Erica
large genus of low much-branched woody evergreens ranging from prostrate subshrubs to trees: true heaths
 
genus Erigeron
cosmopolitan genus of usually perennial herbs with flowers that resemble asters; leaves occasionally (especially formerly) used medicinally
 
genus Eriobotrya
Asiatic evergreen fruit trees
 
genus Eriocaulon
type genus of the Eriocaulaceae: rushlike aquatic or marginal perennials usually found in shallow waters of acid lakes and pools and bogs
 
genus Eriodictyon
small genus of evergreen shrubs of southwestern United States and Mexico
 
genus Eriogonum
North American herbs of the buckwheat family
 
genus Eriophorum
cotton grass
 
genus Eriophyllum
genus of hairy herbs and shrubs of western North America
 
genus Erodium
geraniums of Europe and South America and Australia especially mountainous regions
 
genus Eruca
annual to perennial herbs of the Mediterranean region
 
genus Eryngium
large genus of decorative plants with thistlelike flower heads; cosmopolitan in distribution
 
genus Erysimum
large genus of annual or perennial herbs some grown for their flowers and some for their attractive evergreen leaves; Old World and North America
 
genus Erysiphe
genus of powdery mildews
 
genus Erythrina
genus of attractive tropical shrubs or trees with usually red flowers
 
genus Erythronium
perennial bulbous herbs most of northern United States: dogtooth violet; adder's tongue; trout lily; fawn lily
 
genus Erythroxylon
a large genus of South American shrubs and small trees of the family Erythroxylaceae
 
genus Eschscholtzia
showy herbs of western North America
 
genus Eucalyptus
tall trees native to the Australian region; source of timber and medicinal oils from the aromatic leaves
 
genus Eucarya
quandong trees
 
genus Eugenia
tropical trees and shrubs with aromatic leaves and often valuable hard wood
 
genus Euonymus
widely distributed chiefly evergreen shrubs or small trees or vines
 
genus Eupatorium
large genus of chiefly tropical herbs having heads of white or purplish flowers
 
genus Euphorbia
type genus of the Euphorbiaceae: very large genus of diverse plants all having milky juice
 
genus Eurotium
a genus of fungi belonging to the order Eurotiales
 
genus Eustoma
small genus of herbs of warm regions of southern North America to northern South America
 
genus Euterpe
a monocotyledonous genus of graceful palm trees in tropical America
 
genus Evernia
lichens of the family Usneaceae having a pendulous or shrubby thallus
 
genus Exacum
genus of tropical Asiatic and African plants: especially Persian violets
 
genus Fabiana
genus of South and Central American heathlike evergreen shrubs
 
genus Fagopyrum
buckwheat; in some classifications included in the genus Polygonum
 
genus Fagus
beeches
 
genus Falcatifolium
sickle pines: dioecious evergreen tropical trees and shrubs having sickle-shaped leaves; similar to Dacrycarpus in habit; Malaysia and Philippines to New Guinea and New Caledonia
 
genus Feijoa
small South American shrubs or trees
 
genus Felicia
genus of tropical African herbs or subshrubs with usually blue flowers
 
genus Ferocactus
genus of nearly globular cacti of Mexico and southwestern United States: barrel cacti
 
genus Festuca
a genus of tufted perennial grasses of the family Gramineae
 
genus Ficus
large genus of tropical trees or shrubs or climbers including fig trees
 
genus Filago
genus of small woolly herbs
 
genus Firmiana
small genus of Asian trees or shrubs
 
genus Fistulina
fungi having each pore separate though crowded
 
genus Flacourtia
often spiny trees or shrubs of tropical Asia and Africa
 
genus Flammulina
a genus of agarics
 
genus Flindersia
small genus of Australian timber trees
 
genus Foeniculum
very small genus of aromatic European herbs with pinnately compound leaves and yellow flowers
 
genus Fomes
genus of bracket fungi forming corky or woody perennial shelflike sporophores often of large size; includes some that cause destructive heartrot in trees
 
genus Forestiera
genus of often spiny American shrubs and trees
 
genus Forsythia
forsythia
 
genus Fortunella
small genus of shrubs native to south China producing small ovoid fruits resembling oranges: includes kumquats
 
genus Fothergilla
small genus of deciduous shrubs of the southeastern United States
 
genus Fouquieria
resinous succulent trees or shrubs of desert and semidesert regions of southwestern United States that are leafless most of the year
 
genus Fragaria
strawberries
 
genus Francoa
perennial evergreen herbs with white or pink flowers; Chile
 
genus Frasera
genus of North American herbs: columbo; includes some species sometimes placed in genus Swertia
 
genus Fraxinus
ash
 
genus Freesia
cormous perennial herbs; native to South Africa
 
genus Fremontodendron
flannelbush
 
genus Fritillaria
fritillary
 
genus Froelichia
genus of erect or procumbent herbs of the Americas having spikes of woolly white flowers: cottonweed
 
genus Fuchsia
large genus of decorative tropical shrubs with pendulous tetramerous flowers
 
genus Fumaria
annual herbs whose flowers have only one petal spurred at the base
 
genus Funka
robust east Asian clump-forming perennial herbs having racemose flowers: plantain lilies; sometimes placed in family Hostaceae
 
genus Fusarium
a form genus of mostly plant parasites some of which cause dry rot; in humans a species can cause inflammation of cornea leading to blindness
 
genus Fuscoboletinus
a genus of fungi belonging to the family Boletaceae
 
genus Gaillardia
genus of western American hairy herbs with showy flowers
 
genus Galax
evergreen herbs of southeastern United States
 
genus Galega
small genus of Eurasian herbs: goat's rue
 
genus Galeopsis
erect annual European herbs
 
genus Galium
annual or perennial herbs: bedstraw; cleavers
 
genus Garcinia
evergreen trees and shrubs: mangosteens
 
genus Gardenia
large genus of attractive Old World tropical shrubs and small trees
 
genus Gastroboletus
a genus of fungi belonging to the family Secotiaceae; they resemble boletes but the spores are not discharged from the basidium
 
genus Gastrocybe
a genus of fungi of the family Secotiaceae
 
genus Gastrolobium
genus of Australian evergreen shrubs poisonous to livestock: poison bush
 
genus Gaultheria
widely distributed genus of creeping or upright evergreen shrubs
 
genus Gaylussacia
deciduous or evergreen shrubs of North America: black huckleberries
 
genus Gazania
genus of tomentose tropical African herbs with milky sap
 
genus Geastrum
type genus of Geastraceae; fungi whose outer peridium when dry splits into starlike segments
 
genus Gelsemium
evergreen twining shrubs of Americas and southeastern Asia
 
genus Genipa
tropical American evergreen trees or shrubs bearing yellow flowers and succulent edible fruit with a thick rind
 
genus Genista
chiefly deciduous shrubs or small trees of Mediterranean area and western Asia: broom
 
genus Genlisea
small genus of carnivorous plants of tropical African swamps
 
genus Gentiana
type genus of the Gentianaceae; cosmopolitan genus of herbs nearly cosmopolitan in cool temperate regions; in some classifications includes genera Gentianopsis and Gentianella
 
genus Gentianella
genus of herbs with flowers that resemble gentian; in some classifications included in genus Gentiana
 
genus Gentianopsis
genus of fringed gentians; in some classifications included in genus Gentiana
 
genus Geoffroea
small genus of shrubs or small trees of tropical and subtropical America
 
genus Geoglossum
type genus of the Geoglossaceae comprising the earthtongues
 
genus Geranium
genus of mostly North American geraniums: cranesbills
 
genus Gerardia
genus of annual or perennial herbs with showy pink or purple or yellow flowers; plants often assigned to genera Aureolaria or Agalinis
 
genus Gerbera
genus of South African or Asiatic herbs: African daisies
 
genus Gerea
small genus of hairy herbs with yellow flowers
 
genus Gesneria
large genus of tropical American herbs having showy tubular flowers
 
genus Geum
avens
 
genus Ginkgo
sole surviving genus of the Ginkgoaceae
 
genus Gladiolus
gladiolas
 
genus Glaucium
herbs of Europe and North Africa and Asia: horned poppy
 
genus Glaux
sea milkwort
 
genus Glechoma
ground ivy
 
genus Gleditsia
deciduous trees: honey locusts
 
genus Gleichenia
type genus of Gleicheniaceae: leptosporangiate ferns with sessile sporangia; South Africa to Malaysia and New Zealand
 
genus Gliricidia
small genus of low-branching profusely flowering trees of tropical America
 
genus Gloriosa
sometimes placed in family Colchicaceae; one species: glory lily
 
genus Glossodia
small genus of Australian orchids
 
genus Gloxinia
small genus of tropical American herbs with leafy stems and axillary flowers
 
genus Glyceria
manna grass
 
genus Glycine
genus of Asiatic erect or sprawling herbs: soya bean
 
genus Glycyrrhiza
sticky perennial Eurasian herbs
 
genus Gnaphalium
large widely distributed genus of coarse hairy herbs with whitish involucres
 
genus Gnetum
type genus of the Gnetaceae; small trees or shrubs usually with climbing jointed stems and terminal spikes of flowers with orange-red seeds clustered in rough cones
 
genus Gomphrena
genus of tropical herbs or subshrubs having flowers in close heads; tropical America and Australia
 
genus Goniopteris
terrestrial ferns of Florida and West Indies to Central and South America
 
genus Goodyera
genus of small orchids of the northern hemisphere with creeping rhizomes and stalked ovate leaves and small flowers
 
genus Gossypium
herbs and shrubs and small trees: cotton
 
genus Grammatophyllum
small genus of large epiphytic or terrestrial orchids of southeastern Asia to Polynesia; the giants of the Orchidaceae having long narrow leaves and drooping flower clusters often 6 feet long
 
genus Graptophyllum
caricature plant
 
genus Grevillea
large genus of Australian shrubs and trees having usually showy orange or red flowers
 
genus Grewia
a genus of tropical and subtropical Old World climbers or shrubs or trees
 
genus Grias
anchovy pear tree
 
genus Grindelia
large genus of coarse gummy herbs of western North and Central America
 
genus Griselinia
evergreen shrubs of New Zealand and South America
 
genus Groenlandia
a monocotyledonous genus of the family Potamogetonaceae
 
genus Guaiacum
small genus of evergreen resinous trees or shrubs of warm and tropical America
 
genus Guevina
one species: Chilean nut
 
genus Gutierrezia
sticky perennial herbs and subshrubs of western North America and warm South America
 
genus Gymnadenia
small genus of terrestrial orchids of North America and temperate Eurasia
 
genus Gymnadeniopsis
genus of North American terrestrial orchids usually included in genus Habenaria
 
genus Gymnocalycium
large genus of low-growing globular South American cacti with spiny ribs covered with many tubercles
 
genus Gymnocarpium
oak ferns: in some classification systems included in genus Thelypteris
 
genus Gymnocladus
small genus of deciduous trees of China and United States having paniculate flowers and thick pulpy pods
 
genus Gymnopilus
a genus of fungus characterized by the orange color of the spore deposit
 
genus Gymnosporangium
genus of fungi that produce galls on cedars and other conifers of genera Juniperus and Libocedrus and causes rust spots on apples and pears and other plants of family Rosaceae
 
genus Gynura
genus of Old World tropical herbs: velvet plants
 
genus Gypsophila
Mediterranean herbs having small white or pink flowers
 
genus Gyromitra
a genus of fungi of the family Helvellaceae with a fertile portion that is tan to brown
 
genus Haastia
genus of New Zealand mat-forming herbs or subshrubs: vegetable sheep
 
genus Habenaria
chiefly terrestrial orchids with tubers or fleshy roots often having long slender spurs and petals and lip lobes; includes species formerly placed in genus Gymnadeniopsis
 
genus Hackelia
stickweed; beggar's lice
 
genus Haemanthus
genus of African deciduous or evergreen bulbous herbs: blood lilies
 
genus Haematoxylum
small genus of tropical American spiny bushy shrubs or trees
 
genus Haemodorum
type genus of family Haemodoraceae
 
genus Hakea
Australian shrubs and small trees with evergreen usually spiny leaves and dense clusters of showy flowers
 
genus Halenia
genus of herbs of Eurasia and the Americas: spurred gentians
 
genus Halesia
deciduous small trees or shrubs of China and eastern North America
 
genus Halimodendron
one species: salt tree
 
genus Halocarpus
dioecious trees or shrubs of New Zealand; similar in habit to Dacrydium
 
genus Halogeton
a caryophyllaceous genus of the family Chenopodiaceae
 
genus Hamamelidanthum
genus of fossil plants of the Oligocene having flowers resembling those of the witch hazel; found in Baltic region
 
genus Hamamelidoxylon
genus of fossil plants having wood identical with or similar to that of the witch hazel
 
genus Hamamelis
deciduous shrubs or small trees: witch hazel
 
genus Hamamelites
genus of fossil plants having leaves similar to those of the witch hazel
 
genus Hamelia
evergreen tropical American shrubs or small trees
 
genus Haplopappus
genus of North and South American perennial herbs or shrubs with yellow flowers; in some classifications include species placed in other genera especially Hazardia
 
genus Hardenbergia
small genus of Australian woody vines with small violet flowers; closely related to genus Kennedia
 
genus Harpullia
genus of tropical Asiatic and African trees
 
genus Harrisia
genus of slender often treelike spiny cacti with solitary showy nocturnal white or pink flowers; Florida and Caribbean to South America
 
genus Hatiora
small genus of South American epiphytic or lithophytic cacti
 
genus Hazardia
small genus of shrubs and subshrubs of western United States having flowers that change color as they mature
 
genus Hedeoma
small genus of American herbs (American pennyroyal)
 
genus Hedera
Old World woody vines
 
genus Hedysarum
genus of herbs of north temperate regions
 
genus Helenium
genus of American herbs with flowers having yellow rays: sneezeweeds
 
genus Heliamphora
genus of pitcher plants of the Guiana Highlands in South America
 
genus Helianthemum
widely distributed evergreen or semi-evergreen shrublets; America; Europe and North Africa to Asia Minor and central Asia
 
genus Helianthus
genus of tall erect or branched American annual or perennial herbs with showy flowers: sunflowers
 
genus Helichrysum
large genus of mostly African and Australian herbs and shrubs: everlasting flowers; in some classifications includes genus Ozothamnus
 
genus Helicteres
genus of shrubs and small trees of tropical America and Asia having cylindrical fruits spirally twisted around one another
 
genus Heliophila
genus of South African flowering herbs and subshrubs
 
genus Heliopsis
oxeye
 
genus Helipterum
genus of South African and Australian herbs or shrubs grown as everlastings; the various Helipterum species are currently in process of being assigned to other genera especially genera Pteropogon and Hyalosperma
 
genus Helleborus
a genus of Helleborus
 
genus Helminthostachys
one species: terrestrial fern of southeastern Asia and Australia
 
genus Helotium
type genus of the Helotiaceae
 
genus Helvella
type genus of the Helvellaceae
 
genus Helwingia
deciduous dioecious shrubs native to woodland thickets in low mountains in Japan
 
genus Hemerocallis
east Asian rhizomatous clump-forming perennial herbs having flowers on long leafless stalks; cosmopolitan in cultivation: day lilies; sometimes placed in subfamily Hemerocallidaceae
 
genus Hepatica
small genus of perennial herbs of north temperate regions; allied to genus Anemone
 
genus Heracleum
widely distributed genus of plants with usually thick rootstocks and large umbels of white flowers
 
genus Hermannia
genus of African herbs and subshrubs having honey-scented bell-shaped flowers
 
genus Hernaria
low-growing Old World herbs with minute bright green leaves
 
genus Hesperis
biennial or perennial erect herbs having nocturnally fragrant flowers
 
genus Heteranthera
mud plantains
 
genus Heteromeles
one species: toyon; in some classifications included in genus Photinia
 
genus Heterotheca
genus of yellow-flowered North American herbs
 
genus Heuchera
genus of North American herbs with basal cordate or orbicular leaves and small panicled flowers
 
genus Hevea
small genus of South American trees yielding latex
 
genus Hexalectris
a monocotyledonous genus of the family Orchidaceae
 
genus Hibbertia
evergreen heathlike or scandent shrubs of Madagascar; Australasia; Polynesia
 
genus Hibiscus
large genus of tropical and subtropical herbs and shrubs and trees often grown as ornamentals for their profusion of large flowers in a variety of colors
 
genus Hieracium
large genus of perennial hairy herbs of Europe to western Asia to northwestern Africa and North America; few are ornamental; often considered congeneric with Pilosella
 
genus Himantoglossum
small genus of terrestrial orchids of Europe and Mediterranean region
 
genus Hippeastrum
bulbous flowering plants of tropical America
 
genus Hippocrepis
species of Old World herbs or subshrubs: horseshoe vetch
 
genus Hoheria
small genus of shrubs and small trees of New Zealand: lacebarks
 
genus Holarrhena
genus of deciduous trees and shrubs of tropical Africa and Asia
 
genus Holcus
a genus of Old World grasses widely cultivated in America
 
genus Homogyne
small genus of low perennial herbs of montane Europe; in some classifications included in genus Tussilago
 
genus Hordeum
annual to perennial grasses of temperate northern hemisphere and South America: barley
 
genus Horneophyton
Devonian fossil plant considered one of the earliest forms of vascular land plants; similar to genus Rhynia but smaller
 
genus Hottonia
aquatic herbs
 
genus Houttuynia
one species; east Asian low-growing plant of wet places
 
genus Hovea
genus of Australian evergreen shrubs
 
genus Hoya
large genus of climbing shrubs of Australia and Asia and Polynesia
 
genus Hudsonia
small evergreen subshrubs of North America
 
genus Hugueninia
one species: tansy-leaved rocket
 
genus Hulsea
small genus of erect balsam-scented herbs; Pacific coast of the northwestern United States
 
genus Humulus
hops: hardy perennial vines of Europe, North America and central and eastern Asia producing a latex sap; in some classifications included in the family Urticaceae
 
genus Hunnemania
one species: golden cup
 
genus Hyacinthoides
small genus of perennial bulbs of western Europe and North Africa; sometimes placed in family Hyacinthaceae
 
genus Hyacinthus
sometimes placed in family Hyacinthaceae as the type genus
 
genus Hyalosperma
genus of herbs of temperate Australia including some from genus Helipterum
 
genus Hybanthus
a genus of herbs and small shrubs with white or purple flowers; grows in tropical or subtropical regions
 
genus Hydnum
type genus of Hydnaceae
 
genus Hydrangea
type genus of Hydrangeaceae; large genus of shrubs and some trees and vines with white or pink or blue flower clusters; sometimes placed in family Saxifragaceae
 
genus Hydrastis
small genus of perennial herbs having rhizomes and palmate leaves and small solitary flowers; of northeastern United States and Japan
 
genus Hydrilla
one species
 
genus Hydrocharis
frogbit
 
genus Hydrophyllum
waterleaf
 
genus Hygrocybe
a genus of fungi belonging to the family Hygrophoraceae
 
genus Hygrophorus
a genus of fungi belonging to the family Hygrophoraceae
 
genus Hygrotrama
a genus of fungi belonging to the family Hygrophoraceae
 
genus Hylocereus
genus of climbing or epiphytic tropical American cacti with angular stems and mostly white very fragrant flowers
 
genus Hymenaea
genus of tropical American timber trees
 
genus Hymenanthera
a genus of slender evergreen shrubs; grow in Australia and New Zealand
 
genus Hymenophyllum
type genus of the Hymenophyllaceae: filmy ferns
 
genus Hyoscyamus
genus of poisonous herbs: henbane
 
genus Hypericum
large almost cosmopolitan genus of evergreen or deciduous shrubs and herbs with often showy yellow flowers; cosmopolitan except tropical lowlands and Arctic or high altitudes and desert regions
 
genus Hypochoeris
widely distributed genus of herbs with milky juice; includes some cosmopolitan weeds
 
genus Hypopitys
term used in some classifications for the pinesaps, which are usually included in the genus Monotropa
 
genus Hypoxis
small plants that resemble amaryllis and that grow from a corm and bear flowers on a leafless stalk; sometimes classified as member of the family Amaryllidaceae: star grass
 
genus Hyssopus
Eurasian genus of perennial herbs or subshrubs
 
genus Iberis
Old World herbs and subshrubs: candytuft
 
genus Idesia
one species
 
genus Ilex
a large genus of dicotyledonous trees and shrubs of the family Aquifoliaceae that have small flowers and berries (including hollies)
 
genus Iliamna
small genus of perennial herbs or subshrubs; some often placed in other genera
 
genus Illecebrum
one species: coral necklace
 
genus Illicium
anise trees: evergreen trees with aromatic leaves
 
genus Impatiens
annual or perennial herbs with stems more or less succulent; cosmopolitan except for South America, Australia, and New Zealand
 
genus Indigofera
genus of tropical herbs and shrubs having odd-pinnate leaves and spurred flowers in long racemes or spikes
 
genus Inga
genus of tropical trees or shrubs
 
genus Inula
genus of Old World herbs or subshrubs: elecampane
 
genus Ipomoea
morning glory
 
genus Iresine
genus of tropical American herbs or subshrubs
 
genus Iris
large genus of perennials that develop from bulbs or rhizomes
 
genus Irvingia
wild mango
 
genus Isatis
Old World genus of annual to perennial herbs: woad
 
genus Isoetes
type and genus of the Isoetaceae and sole extant genus of the order Isoetales
 
genus Isopyrum
tufted perennial herbs of northern hemisphere
 
genus Iva
small genus of American herbs or shrubs; in some classifications placed in a separate family Ambrosiaceae
 
genus Ixia
a monocotyledonous genus of the family Iridaceae
 
genus Jacksonia
genus of yellow-flowered Australian unarmed or spiny shrubs without true leaves but having leaflike stems or branches
 
genus Jacquinia
sometimes placed in family Myrsinaceae
 
genus Jambos
used in some classifications for rose apples (Eugenia jambos)
 
genus Jamesonia
xerophytic ferns of South America
 
genus Jasminum
shrubs and woody climbers mostly of tropical and temperate Old World: jasmine; jessamine
 
genus Jatropha
a mainly tropical genus of American plant belonging to the family Euphorbiaceae
 
genus Juglans
type genus of the Juglandaceae
 
genus Juncus
type genus of the Juncaceae; perennial tufted glabrous marsh plants of temperate regions: rushes
 
genus Juniperus
junipers
 
genus Kalmia
erect evergreen shrubs: mountain laurel
 
genus Kennedya
genus of Australian woody vines having showy red or purplish flowers
 
genus Keteleeria
a genus of keteleeria
 
genus Khaya
African mahogany trees
 
genus Kiggelaria
small genus of South African shrubs or small trees
 
genus Kirkia
small genus of tropical South African trees and shrubs
 
genus Knightia
small genus of trees or shrubs of New Zealand and New Caledonia
 
genus Kniphofia
genus of showy clump-forming African herbs with grasslike leaves; sometimes placed in family Aloeaceae
 
genus Kohleria
genus of tropical American shrubs
 
genus Kolkwitzia
Chinese genus of 1 species: beauty bush
 
genus Kosteletzya
small genus of herbs of southeastern United States and tropical America and Africa
 
genus Krigia
small herbs closely related to chicory: dwarf dandelions
 
genus Lablab
one species: hyacinth bean
 
genus Laburnum
flowering shrubs or trees having bright yellow flowers; all parts of the plant are poisonous
 
genus Laccopetalum
one species: giant buttercup
 
genus Lactarius
large genus of agarics that have white spore and contain a white or milky juice when cut or broken; includes both edible and poisonous species
 
genus Lactuca
an herb with milky juice: lettuce; prickly lettuce
 
genus Laelia
large genus of mostly epiphytic or lithophytic Central and South American orchids of various sizes
 
genus Lagarostrobus
genus of dioecious evergreen trees of New Zealand and Tasmania; similar to genus Dacrydium
 
genus Lagenaria
bottle gourds
 
genus Lagenophera
small genus of herbs of Australia and South America having small solitary white or purple flowers similar to true daisies of genus Bellis
 
genus Lagerstroemia
shrubs or small trees of tropical Asia and Africa usually with showy white, pink, or purplish flowers
 
genus Laguncularia
a genus of Laguncularia
 
genus Lambertia
small genus of Australian shrubs
 
genus Lamium
genus of Old World herbs: dead nettles; henbits
 
genus Lansium
a dicotyledonous genus of the family Meliaceae
 
genus Laportea
mostly tropical stinging herbs or trees: nettle
 
genus Lardizabala
evergreen monoecious climbers of South America having dark mauve-blue edible berries
 
genus Larix
larches
 
genus Larrea
xerophytic evergreen shrubs; South America to southwestern United States
 
genus Lasthenia
small genus of herbs of Pacific coast of North and South America
 
genus Lastreopsis
tropical terrestrial shield ferns
 
genus Lathyrus
genus of climbing herbs of Old World and temperate North and South America: vetchling; wild pea
 
genus Laurus
small evergreen trees or shrubs with aromatic leaves
 
genus Lavandula
lavender
 
genus Lavatera
widespread genus of herbs or softwood arborescent shrubs cultivated for their showy flowers
 
genus Layia
genus of western United States annuals with showy yellow or white flowers
 
genus Lecanopteris
epiphytic ferns of southeastern Asia to New Guinea
 
genus Lecanora
type genus of Lecanoraceae; crustaceous lichens
 
genus Leccinum
a genus of fungi belonging to the family Boletaceae
 
genus Ledum
evergreen shrubs of north temperate regions
 
genus Leiophyllum
one species: sand myrtle
 
genus Leitneria
one species: corkwood
 
genus Lemaireocereus
tropical American cacti usually tall and branching with stout spines and funnel-shaped flowers and globular or ovoid often edible fruit
 
genus Lemna
minute aquatic herbs floating on or below the water surface of still water consisting of a leaflike frond or plant body and single root
 
genus Lens
genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils
 
genus Lentinus
a genus of fungus belonging to the family Tricholomataceae
 
genus Leonotis
small genus of tropical herbs and subshrubs of South Africa
 
genus Leontodon
hawkbit
 
genus Leontopodium
edelweiss
 
genus Leonurus
genus of stout Old World herbs having flowers in whorls
 
genus Lepechinia
a dicotyledonous genus of the family Labiatae
 
genus Lepidium
cosmopolitan genus of annual and biennial and perennial herbs: cress
 
genus Lepidobotrys
a genus of dicotyledonous trees belonging to the family Lepidobotryaceae
 
genus Lepidothamnus
small usually shrubby conifers
 
genus Lepiota
agarics with white spores that includes several edible and poisonous mushrooms: parasol mushrooms
 
genus Leptarrhena
one species: leatherleaf saxifrage
 
genus Leptopteris
including some ferns sometimes placed in genus Todea
 
genus Lespedeza
genus of shrubs or herbs of tropical Asia and Australia and the eastern United States
 
genus Lesquerella
genus of low-growing hairy herbs: bladderpods
 
genus Leucadendron
large genus of evergreen trees and shrubs having silvery white leaves and solitary terminal flowers with conspicuous silvery bracts
 
genus Leucaena
small genus of tropical evergreen trees or shrubs having pods like those of the acacia
 
genus Leucanthemum
comprises plants often included in the genus Chrysanthemum
 
genus Leucogenes
New Zealand edelweiss
 
genus Leucothoe
American and Asiatic deciduous and evergreen shrubs
 
genus Levisticum
genus of aromatic European herbs with yellow flowers
 
genus Lewisia
genus of western North American low-growing herbs having linear woolly leaves and large pink flowers
 
genus Leycesteria
small species of shrubs of western Himalayas to China
 
genus Leymus
genus that in some classifications overlaps the genus Elymus
 
genus Liatris
genus of perennial North American herbs with aromatic usually cormous roots
 
genus Libocedrus
cypresses that resemble cedars
 
genus Ligularia
genus of Old World herbs resembling groundsel: leopard plants
 
genus Ligustrum
genus of Old World shrubs: privet
 
genus Lilium
type genus of Liliaceae
 
genus Limnobium
American frogbit
 
genus Limonium
sea lavender
 
genus Linanthus
a genus of herbs of the family Polemoniaceae; found in western United States
 
genus Linaria
genus of herbs and subshrubs having showy flowers: spurred snapdragon
 
genus Lindera
aromatic evergreen or deciduous dioecious shrubs or trees of eastern Asia and North America
 
genus Lindheimera
one species: Texas star
 
genus Linnaea
one species: twinflower
 
genus Linum
a herbaceous plant genus of the family Linaceae with small sessile leaves
 
genus Liparis
genus of terrestrial and epiphytic orchids; pantropical to temperate
 
genus Liquidambar
sweet gum
 
genus Liriodendron
tulip trees
 
genus Liriope
sometimes placed in family Convallariaceae: lilyturf
 
genus Listera
genus of terrestrial orchids having usually a single pair of broad shining leaves near the middle of the stem; found in temperate Asia and North America and Europe
 
genus Litchi
Chinese trees
 
genus Lithocarpus
tanbark oaks
 
genus Lithophragma
small genus of perennial herbs of the western North America
 
genus Lithops
genus of stemless South African succulents
 
genus Lithospermum
annual or perennial herbaceous or shrubby plants; cosmopolitan except Australia
 
genus Livistona
fan palms of Asia and Australia and Malaysia
 
genus Loasa
genus of tropical American prickly herbs or subshrubs
 
genus Lobelia
in some classifications considered the type genus of a separate family Lobeliaceae
 
genus Lobularia
sweet alyssum
 
genus Logania
type genus of the Loganiaceae; Australian and New Zealand shrubs sometimes cultivated for their flowers
 
genus Loiseleuria
one species: alpine azalea
 
genus Lolium
darnel; ryegrass
 
genus Lomatia
small genus of low-growing evergreens of Chile and Australia; some yield dyes
 
genus Lomogramma
large scandent ferns of southeastern Asia
 
genus Lonas
one species: yellow ageratum
 
genus Lonchocarpus
genus of chiefly tropical American shrubs and trees having pinnate leaves and red or white flowers
 
genus Lonicera
woodbine
 
genus Lophophora
two species of small cacti of northeastern Mexico and southwestern United States having rounded stems covered with jointed tubercles: mescal
 
genus Lophosoria
one species: tree fern of Central and South America
 
genus Loranthus
type genus of the Loranthaceae: 1 species
 
genus Lotus
annual or perennial herbs or subshrubs
 
genus Lovoa
genus of African timber trees
 
genus Loxoma
one species of terrestrial ferns of New Zealand
 
genus Luffa
dishcloth gourds
 
genus Lunaria
small genus of European herbs: honesty
 
genus Lupinus
herbs or shrubs: lupin
 
genus Lychnis
genus of plants strongly resembling those of genus Silene: catchfly
 
genus Lycium
deciduous and evergreen shrubs often spiny; cosmopolitan in temperate and subtropical regions
 
genus Lycoperdon
genus of fungi whose fruiting body tapers toward a base consisting of spongy mycelium
 
genus Lycopersicum
tomatoes
 
genus Lycopodium
type and sole genus of the Lycopodiaceae; erect or creeping evergreen plants often used for Christmas decorations
 
genus Lycopus
small genus of herbs of the mint family
 
genus Lyginopteris
genus of fossil seed ferns of the Carboniferous
 
genus Lygodium
chiefly tropical climbing ferns
 
genus Lyonia
evergreen or deciduous shrubs or small trees of United States to Antilles and eastern Asia to the Himalaya
 
genus Lysichitum
skunk cabbage
 
genus Lysiloma
small genus of tropical American trees and shrubs with pinnate leaves and flat straight pods
 
genus Lysimachia
loosestrife: a cosmopolitan genus found in damp or swampy terrain having usually yellow flowers; inclined to be invasive
 
genus Lythrum
loosestrife
 
genus Macadamia
trees or shrubs; Madagascar to Australia
 
genus Machaeranthera
wildflowers of western North America