perennial ragweed

Definitions of perennial ragweed
  1. noun
    coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
    synonyms: Ambrosia psilostachya, western ragweed
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    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
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