noun
- A weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized.
- synonyms: lesser knapweed, black knapweed, hardheads
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). Centaurea nigra. Retrieved September 20, 2026, from http://smartdefine.org/centaurea_nigra/definitions/1264243 |
| Chicago | WordNet. 2010. "Centaurea nigra" http://smartdefine.org/centaurea_nigra/definitions/1264243 (accessed September 20, 2026). |
| Harvard | WordNet 2010, Centaurea nigra, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/centaurea_nigra/definitions/1264243>. |
| MLA | WordNet. "Centaurea nigra" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/centaurea_nigra/definitions/1264243> |