| NOUN | plant | lesser knapweed, black knapweed, hardheads, Centaurea nigra | a weedy perennial with tough / tough wiry stems and purple flowers |
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| Meaning | A weedy perennial with tough / tough wiry stems and purple flowers; native to Europe but widely naturalized. | |
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| Synonyms | black knapweed, hardheads, Centaurea nigra | |
| Broader | knapweed | Any of various plants of the genus Centaurea having purple thistlelike flowers |
| Spanish | hardheads | |
| Catalan | hardheads | |
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