knapweed

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Related to lesser knapweed: black knapweed, meadow buttercup, common knapweed

knapweed

any of several plants of the genus Centaurea, having purplish thistle-like flowers: family Asteraceae (composites)
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It's been of great benefit to wildlife, with species such as lesser knapweed, agrimony, wild angelica and unusual trailing tormentil providing a colourful backdrop to a pleasant day's golf.