bitterweed

1. Widespread European weed with spiny tongue-shaped leaves and yellow flowers;
   Naturalized in United States (synset 112023636)
   is a type of: weed - any plant that crowds out cultivated plants
   belongs to: genus picris, picris - genus of weedy Old World yellow-flowered herbs usually containing a bitter-tasting substance: bitterweed
   same as: bristly oxtongue, bugloss, oxtongue, picris echioides
2. Any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma (synset 111939916)
   is a type of: weed - any plant that crowds out cultivated plants
   subtypes:

   • ambrosia artemisiifolia, common ragweed - annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally
   • ambrosia trifida, great ragweed - a coarse annual with some leaves deeply and palmately three-cleft or five-cleft
   • ambrosia psilostachya, perennial ragweed, western ragweed - coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
   belongs to: genus ambrosia - comprising the ragweeds; in some classification considered the type genus of a separate family Ambrosiaceae
   same as: ambrosia, ragweed

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