knapweed definition

  • noun:
    • any one of numerous thistles for the genus Centaurea, having variously coloured flowers grouped in a head with a spiny involucre.
    • some of different common weeds for the genus Centaurea
    • The black colored centaury (Centaurea nigra); -- so-called from knoblike minds of flowers. Called in addition bullweed.
    • an over-all title for flowers of genus Centaurea associated with the composite household, as C. Calcitrapa, the star-thistle, and C. Cyanus, bachelor's buttons.
    • especially, C. nigra, also called buttonweed, hardhead, loggerhead, and also by some other names.
    • some of different flowers for the genus Centaurea having purple thistlelike flowers

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  • Definition for "knapweed"
    • any one of numerous thistles for the genus…
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