Calflora, a 501c3 non-profit
Distribution by County   11496    
Centaurea jacea  L.  ssp. nigra  (L.) Bonnier & Layens
Black knapweed
Centaurea jacea ssp. nigra is a perennial herb that is not native to California.
Record Count by County

Alameda: 2 Humboldt: 4 Siskiyou: 2
Del Norte: 1 Monterey: 2

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2023. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: 09/22/2023).