Calflora, a 501c3 non-profit
Distribution by County   8084    
Trifolium incarnatum  L.
Crimson clover
Trifolium incarnatum is an annual herb that is not native to California.
Record Count by County

Alameda: 21 Los Angeles: 6 San Diego: 4 Sonoma: 40
Amador: 2 Marin: 21 San Francisco: 10 Stanislaus: 1
Butte: 15 Mariposa: 2 San Joaquin: 1 Sutter: 1
Calaveras: 1 Mendocino: 20 San Luis Obispo: 18 Tehama: 3
Contra Costa: 18 Monterey: 24 San Mateo: 8 Trinity: 1
Del Norte: 2 Napa: 11 Santa Barbara: 13 Tulare: 1
El Dorado: 6 Nevada: 5 Santa Clara: 19 Tuolumne: 4
Fresno: 3 Orange: 4 Santa Cruz: 11 Ventura: 3
Glenn: 3 Placer: 22 Shasta: 4 Yolo: 4
Humboldt: 16 Riverside: 2 Sierra: 1 Yuba: 2
Imperial: 1 Sacramento: 11 Siskiyou: 2
Lake: 3 San Bernardino: 1 Solano: 6

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]. 2026. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 03/16/2026).