Calflora, a 501c3 non-profit
Distribution by County   4481    
Juncus mexicanus  Willd.
Mexican rush
Juncus mexicanus is a perennial grasslike herb that is native to California, and also found elsewhere in western North America.
Record Count by County

Alameda: 7 Lassen: 24 Placer: 5 Santa Cruz: 2
Alpine: 3 Los Angeles: 47 Plumas: 15 Shasta: 4
Amador: 1 Madera: 7 Riverside: 74 Sierra: 10
Butte: 6 Marin: 72 Sacramento: 2 Siskiyou: 9
Colusa: 7 Mariposa: 12 San Benito: 17 Solano: 20
Contra Costa: 10 Mendocino: 1 San Bernardino: 84 Sonoma: 10
El Dorado: 21 Merced: 10 San Diego: 254 Sutter: 4
Fresno: 32 Modoc: 42 San Francisco: 8 Trinity: 2
Glenn: 1 Mono: 103 San Joaquin: 1 Tulare: 8
Humboldt: 2 Monterey: 16 San Luis Obispo: 27 Tuolumne: 27
Inyo: 45 Napa: 11 San Mateo: 8 Ventura: 47
Kern: 47 Nevada: 12 Santa Barbara: 45 Yolo: 3
Lake: 5 Orange: 10 Santa Clara: 5

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).