Definitions for black knapweed
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Princeton's WordNet
lesser knapweed, black knapweed, hardheads, Centaurea nigra(noun)
a weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized
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"black knapweed." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/black knapweed>.

