ragweed

Definitions of ragweed
1

n 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
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

n 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
Type of:
weed
any plant that crowds out cultivated plants

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