Calflora, a 501c3 non-profit
Distribution by County   1847    
Centaurea diffusa  Lam.
Diffuse knapweed,   White knapweed
Centaurea diffusa is a perennial herb that is not native to California.
Cal-IPC rating: moderate
Record Count by County

Alpine: 61 Inyo: 7 Placer: 17 Siskiyou: 73
Amador: 24 Lake: 1 Plumas: 10 Solano: 2
Butte: 10 Lassen: 17 Sacramento: 3 Sonoma: 3
Calaveras: 53 Mariposa: 9 San Bernardino: 10 Stanislaus: 1
Colusa: 8 Mendocino: 4 San Joaquin: 1 Tehama: 8
Del Norte: 13 Modoc: 55 Santa Clara: 1 Trinity: 291
El Dorado: 32 Mono: 5 Santa Cruz: 1 Tuolumne: 4
Glenn: 14 Monterey: 5 Shasta: 34 Yolo: 3
Humboldt: 34 Nevada: 16 Sierra: 12

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).