Calflora, a 501c3 non-profit
Distribution by County   1845    
Centaurea calcitrapa  L.
Purple star thistle,   Red star thistle
Centaurea calcitrapa is an annual or perennial herb that is not native to California.
Cal-IPC rating: moderate

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]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: 07/16/2024).