Calflora, a 501c3 non-profit
Distribution by County   1853    
Centaurea solstitialis  L.
Barnaby's thistle,   Yellow star thistle
Centaurea solstitialis is an annual herb that is not native to California.
Cal-IPC rating: high
Record Count by County

Alameda: 914 Lake: 165 Plumas: 979 Siskiyou: 278
Alpine: 14 Lassen: 85 Riverside: 216 Solano: 143
Amador: 460 Los Angeles: 307 Sacramento: 299 Sonoma: 1886
Butte: 816 Madera: 125 San Benito: 295 Stanislaus: 52
Calaveras: 171 Marin: 3849 San Bernardino: 40 Sutter: 41
Colusa: 225 Mariposa: 3777 San Diego: 119 Tehama: 346
Contra Costa: 4217 Mendocino: 114 San Francisco: 28 Trinity: 527
Del Norte: 22 Merced: 373 San Joaquin: 84 Tulare: 277
El Dorado: 1178 Modoc: 39 San Luis Obispo: 278 Tuolumne: 2081
Fresno: 270 Mono: 10 San Mateo: 1195 Ventura: 399
Glenn: 63 Monterey: 214 Santa Barbara: 275 Yolo: 78
Humboldt: 297 Napa: 214 Santa Clara: 1532 Yuba: 194
Inyo: 10 Nevada: 623 Santa Cruz: 122
Kern: 2741 Orange: 284 Shasta: 655
Kings: 22 Placer: 850 Sierra: 90

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).