great ragweed

Noun
  1. A coarse annual with some leaves deeply and palmately three-cleft or five-cleft (synset 111940444)
    is a type of: 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
    same as: ambrosia trifida

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