knapweed


noun

  1. any composite plant of the genus Centaurea, especially the weedy C. nigra, having rose-purple flowers set on a dark-colored, knoblike bract.

noun

  1. any of several plants of the genus Centaurea, having purplish thistle-like flowers: family Asteraceae (composites)See also centaury (def. 2), hardheads

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