bitterweed definition

  • noun:
    • Any plant into the genus Ambrosia, especially Ambrosia artemisiifolia.
    • The plant Artemisia trifida.
    • The plant Helenium amarum.
    • A species of Ambrosia (Ambrosia artemisiæfolia); Roman worm lumber.
    • A name provided to US species of ragweed, Ambrosia artemisiæfolia and A. trifida.
    • widespread European grass with spiny tongue-shaped leaves and yellow blossoms; naturalized in usa
    • any one of numerous chiefly us weedy plants constituting the genus Ambrosia that produce extremely allergenic pollen accountable for much hay fever and symptoms of asthma

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