Calflora, a 501c3 non-profit
Distribution by County   7622    
Silybum marianum  (L.) Gaertn.
Blessed milkthistle,   Milk thistle
Silybum marianum is an annual or perennial herb that is not native to California.
Cal-IPC rating: limited
Record Count by County

Alameda: 458 Kings: 26 Plumas: 1 Shasta: 22
Amador: 10 Lake: 16 Riverside: 37 Siskiyou: 2
Butte: 111 Los Angeles: 855 Sacramento: 100 Solano: 78
Calaveras: 24 Madera: 52 San Benito: 69 Sonoma: 134
Colusa: 9 Marin: 409 San Bernardino: 87 Stanislaus: 95
Contra Costa: 185 Mariposa: 52 San Diego: 189 Sutter: 10
Del Norte: 3 Mendocino: 106 San Francisco: 53 Tehama: 26
El Dorado: 33 Merced: 94 San Joaquin: 60 Tulare: 70
Fresno: 111 Monterey: 242 San Luis Obispo: 113 Tuolumne: 79
Glenn: 17 Napa: 22 San Mateo: 412 Ventura: 129
Humboldt: 33 Nevada: 24 Santa Barbara: 178 Yolo: 75
Imperial: 1 Orange: 930 Santa Clara: 323 Yuba: 14
Kern: 620 Placer: 24 Santa Cruz: 153

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: 12/03/2024).