weed

1. Any plant that crowds out cultivated plants (synset 113105873)
   is a type of: tracheophyte, vascular plant - green plant having a vascular system: ferns, gymnosperms, angiosperms
   subtypes:

   • agrostemma githago, corn campion, corn cockle, crown-of-the-field - European annual having large trumpet-shaped reddish-purple flowers and poisonous seed; a common weed in grainfields and beside roadways; naturalized in America
   • knawe, knawel, scleranthus annuus - widely distributed low-growing Eurasian herb having narrow leaves and inconspicuous green flowers
   • corn spurrey, corn spurry, spergula arvensis - small European weed with whorled leaves and white flowers
   • sand spurry, sea spurry, spergularia rubra - prostrate weedy herb with tiny pink flowers; widespread throughout Europe and Asia on sand dunes and heath and coastal cliffs; naturalized in eastern North America
   • carpetweed, indian chickweed, molluga verticillata - annual prostrate mat-forming weed having whorled leaves and small greenish-white flowers; widespread throughout North America
   • alligator grass, alligator weed, alternanthera philoxeroides - prolific South American aquatic weed having grasslike leaves and short spikes of white flowers; clogs waterways with dense floating masses
   • barbarea vulgaris, rockcress, rocket cress, sisymbrium barbarea, yellow rocket - noxious cress with yellow flowers; sometimes placed in genus Sisymbrium
   • erysimum cheiranthoides, wormseed mustard - slender yellow-flowered European mustard often troublesome as a weed; formerly used as an anthelmintic
   • jointed charlock, raphanus raphanistrum, runch, wild radish, wild rape - Eurasian weed having yellow or mauve or white flowers and podlike fruits
   • pennycress - any of several plants of the genus Thlaspi
   • ambrosia, bitterweed, ragweed - any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
   • thistle - any of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leaves
   • barnaby's thistle, centaurea solstitialis, yellow star-thistle - European weed having a winged stem and hairy leaves; adventive in the eastern United States
   • canadian fleabane, conyza canadensis, erigeron canadensis, fleabane, horseweed - common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron
   • erechtites hieracifolia, fireweed - an American weedy plant with small white or greenish flowers
   • hieracium praealtum, king devil, yellow hawkweed - European hawkweed introduced into northeastern United States; locally troublesome weeds
   • california dandelion, capeweed, cat's-ear, gosmore, hypochaeris radicata - European weed widely naturalized in North America having yellow flower heads and leaves resembling a cat's ears
   • bastard feverfew, parthenium hysterophorus - tropical American annual weed with small radiate heads of white flowers; adventive in southern United States
   • bitterweed, bristly oxtongue, bugloss, oxtongue, picris echioides - widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States
   • hieracium aurantiacum, orange hawkweed, pilosella aurantiaca - European hawkweed having flower heads with bright orange-red rays; a troublesome weed especially as naturalized in northeastern North America; sometimes placed in genus Hieracium
   • senecio doublasii, threadleaf groundsel - bluish-green bushy leafy plant covered with close white wool and bearing branched clusters of yellow flower heads; southwestern United States; toxic to range livestock
   • benweed, ragweed, ragwort, senecio jacobaea, tansy ragwort - widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
   • groundsel, senecio vulgaris - Eurasian weed with heads of small yellow flowers
   • cockle-bur, cockle-burr, cocklebur, cockleburr - any coarse weed of the genus Xanthium having spiny burrs
   • nettle - any of numerous plants having stinging hairs that cause skin irritation on contact (especially of the genus Urtica or family Urticaceae)
   • tumbleweed - any plant that breaks away from its roots in autumn and is driven by the wind as a light rolling mass
   • madnep, wild parsnip - biennial weed in Europe and America having large pinnate leaves and yellow flowers and a bitter and somewhat poisonous root; the ancestor of cultivated parsnip
2. A black band worn by a man (on the arm or hat) as a sign of mourning (synset 104577966)
   is a type of: band - a thin flat strip of flexible material that is worn around the body or one of the limbs (especially to decorate the body)
   same as: mourning band
3. Street names for marijuana (synset 103997192)
   is a type of: cannabis, ganja, marihuana, marijuana - the most commonly used illicit drug; considered a soft drug, it consists of the dried leaves of the hemp plant; smoked or chewed for euphoric effect
   same as: dope, gage, grass, green goddess, locoweed, mary jane, pot, sens, sess, skunk, smoke

1. Clear of weeds (synset 200313972)
   "weed the garden"
   is a type of: remove, take, take away, withdraw - remove something concrete, as by lifting, pushing, or taking off, or remove something abstract
   subtypes: stub - clear of weeds by uprooting them

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