Calflora, a 501c3 non-profit
Distribution by County   8097    
Trifolium microdon  Hook. & Arn.
Thimble clover, Valparaiso clover
Trifolium microdon is an annual herb that is native to California, and endemic (limited) to California.
Record Count by County

Alameda: 25 Los Angeles: 13 Sacramento: 21 Sonoma: 88
Butte: 4 Madera: 1 San Benito: 2 Stanislaus: 2
Calaveras: 2 Marin: 132 San Francisco: 11 Tehama: 12
Colusa: 1 Mariposa: 1 San Luis Obispo: 17 Trinity: 2
Contra Costa: 30 Mendocino: 29 San Mateo: 59 Tuolumne: 2
Del Norte: 5 Merced: 10 Santa Barbara: 13 Ventura: 11
El Dorado: 8 Monterey: 36 Santa Clara: 45 Yolo: 3
Fresno: 1 Napa: 25 Santa Cruz: 21
Humboldt: 20 Nevada: 7 Shasta: 4
Lake: 15 Placer: 3 Solano: 43

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: 05/19/2026).