ragweed

1. Widespread European weed having yellow daisylike flowers;
   Sometimes an obnoxious weed and toxic to cattle if consumed in quantity (synset 112032722)
   is a type of: weed - any plant that crowds out cultivated plants
   belongs to: genus senecio, senecio - enormous and diverse cosmopolitan genus of trees and shrubs and vines and herbs including many weeds
   same as: benweed, ragwort, senecio jacobaea, tansy ragwort
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, bitterweed

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