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
Record Count by County

Alameda: 305 Lake: 18 San Diego: 4 Solano: 148
Amador: 1 Lassen: 1 San Francisco: 2 Sonoma: 509
Butte: 3 Los Angeles: 1 San Joaquin: 4 Stanislaus: 4
Calaveras: 7 Marin: 967 San Luis Obispo: 94 Sutter: 4
Colusa: 16 Mendocino: 15 San Mateo: 1027 Tehama: 3
Contra Costa: 670 Monterey: 34 Santa Barbara: 35 Tulare: 2
Del Norte: 1 Napa: 51 Santa Clara: 316 Tuolumne: 1
El Dorado: 38 Nevada: 5 Santa Cruz: 54 Ventura: 8
Fresno: 7 Placer: 6 Shasta: 4 Yolo: 43
Glenn: 2 Sacramento: 16 Sierra: 1 Yuba: 2
Humboldt: 6 San Benito: 53 Siskiyou: 4

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: https://www.calflora.org/   (Accessed: 09/23/2023).