black knapweed

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Noun1.black knapweed - a weedy perennial with tough wiry stems and purple flowersblack knapweed - a weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized
Centaurea nigra, hardheads, lesser knapweed
knapweed - any of various plants of the genus Centaurea having purple thistlelike flowers
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References in periodicals archive
It is home to rare plants including meadow foxtail, greater bird's-foot-trefoil, red clover, black knapweed, ox-eye daisy and cocksfoot.
It's a disgrace, I'm genuinely disgusted with Powys Council
Oxeye daisy and black knapweed grow in the wildflower areas and you can find greater burnet, ragged robin and yellow rattle in the meadow.
What's On: A Walk In The Park - NEW HALL VALLEY COUNTRY PARK A quiet and clean oasis
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