ragweed

Definitions of ragweed
  1. noun
    any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
    synonyms: ambrosia, bitterweed
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    types:
    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
    type of:
    weed
    any plant that crowds out cultivated plants
  2. noun
    widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
    synonyms: Senecio jacobaea, benweed, ragwort, tansy ragwort
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    type of:
    weed
    any plant that crowds out cultivated plants
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