Calflora, a 501c3 non-profit
Distribution by County   5917    
Onopordum illyricum  L.
Illyrian cottonthistle,   Illyrian thistle
Onopordum illyricum is an annual or biennial herb that is not native to California.
There is a high risk of this plant becoming invasive in California according to Cal-IPC.
Record Count by County

Santa Clara: 17 Sonoma: 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:   (Accessed: 12/09/2023).