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Distribution by County   8109    
Trifolium willdenovii  Spreng.
Tomcat clover
Trifolium willdenovii is an annual herb that is native to California, and also found elsewhere in western North America.
Record Count by County

Alameda: 70 Lake: 26 Riverside: 75 Siskiyou: 6
Amador: 16 Los Angeles: 185 Sacramento: 58 Solano: 76
Butte: 270 Madera: 42 San Benito: 198 Sonoma: 120
Calaveras: 24 Marin: 155 San Bernardino: 30 Stanislaus: 25
Colusa: 7 Mariposa: 60 San Diego: 275 Sutter: 16
Contra Costa: 93 Mendocino: 57 San Francisco: 33 Tehama: 59
Del Norte: 16 Merced: 40 San Joaquin: 14 Trinity: 26
El Dorado: 47 Modoc: 6 San Luis Obispo: 186 Tulare: 105
Fresno: 108 Monterey: 187 San Mateo: 146 Tuolumne: 201
Glenn: 6 Napa: 76 Santa Barbara: 240 Ventura: 118
Humboldt: 49 Nevada: 45 Santa Clara: 179 Yolo: 74
Imperial: 1 Orange: 148 Santa Cruz: 54 Yuba: 21
Kern: 125 Placer: 45 Shasta: 26
Kings: 9 Plumas: 5 Sierra: 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: 05/14/2026).