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Distribution by County   1259    
California water starwort, Winged water starwort
Callitriche marginata is an annual herb (aquatic) that is native to California, and endemic (limited) to California.
Record Count by County

Alameda: 11 Los Angeles: 13 San Benito: 5 Sonoma: 13
Amador: 1 Madera: 2 San Bernardino: 3 Stanislaus: 2
Butte: 34 Marin: 17 San Diego: 55 Sutter: 4
Calaveras: 1 Mariposa: 2 San Francisco: 1 Tehama: 19
Colusa: 2 Mendocino: 11 San Joaquin: 1 Tulare: 3
Contra Costa: 14 Merced: 9 San Luis Obispo: 33 Tuolumne: 1
El Dorado: 1 Monterey: 35 San Mateo: 27 Ventura: 7
Fresno: 7 Napa: 11 Santa Barbara: 34 Yolo: 16
Glenn: 1 Orange: 20 Santa Clara: 5 Yuba: 1
Humboldt: 4 Placer: 4 Santa Cruz: 10
Kern: 3 Riverside: 24 Sierra: 1
Lake: 3 Sacramento: 27 Solano: 17

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: 10/08/2026).