Calflora, a 501c3 non-profit
Distribution by County   11464    
Carduus pycnocephalus  L.  ssp. pycnocephalus 
Italian thistle
Carduus pycnocephalus ssp. pycnocephalus is an annual herb that is not native to California.
Record Count by County

Alameda: 35 Lake: 2 Sacramento: 1 Shasta: 2
Amador: 1 Los Angeles: 17 San Benito: 4 Solano: 8
Butte: 23 Marin: 38 San Bernardino: 1 Sonoma: 16
Calaveras: 1 Mendocino: 10 San Diego: 66 Sutter: 2
Colusa: 4 Merced: 2 San Francisco: 5 Tehama: 2
Contra Costa: 33 Monterey: 66 San Luis Obispo: 19 Trinity: 2
El Dorado: 4 Napa: 5 San Mateo: 95 Ventura: 9
Glenn: 1 Nevada: 1 Santa Barbara: 24 Yolo: 3
Humboldt: 7 Orange: 30 Santa Clara: 39 Yuba: 5
Kern: 1 Riverside: 2 Santa Cruz: 7

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).