black knapweed

/blæk ˌnæpˈwid/
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Other forms: black knapweeds

Definitions of black knapweed
  1. noun
    a weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized
    synonyms: Centaurea nigra, hardheads, lesser knapweed
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    type of:
    knapweed
    any of various plants of the genus Centaurea having purple thistlelike flowers
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