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: 308 Lake: 17 San Francisco: 3 Sonoma: 522
Amador: 1 Lassen: 2 San Joaquin: 4 Stanislaus: 4
Butte: 2 Marin: 1010 San Luis Obispo: 92 Sutter: 4
Calaveras: 6 Mendocino: 13 San Mateo: 1073 Tehama: 2
Colusa: 17 Monterey: 33 Santa Barbara: 35 Tulare: 2
Contra Costa: 670 Napa: 51 Santa Clara: 345 Tuolumne: 1
Del Norte: 1 Nevada: 4 Santa Cruz: 54 Ventura: 9
El Dorado: 37 Placer: 5 Shasta: 4 Yolo: 37
Fresno: 5 Sacramento: 12 Sierra: 1 Yuba: 2
Glenn: 1 San Benito: 62 Siskiyou: 2
Humboldt: 1 San Diego: 4 Solano: 143

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: https://www.calflora.org/   (Accessed: 11/21/2024).