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Distribution by County   11774    
Juncus balticus  Willd.  ssp. ater  (Rydb.) Snogerup
Baltic rush
Juncus balticus ssp. ater is a perennial grasslike herb that is native to California.
Record Count by County

Alameda: 8 Lake: 6 Plumas: 15 Sierra: 6
Alpine: 1 Lassen: 14 Riverside: 6 Siskiyou: 17
Butte: 11 Los Angeles: 14 Sacramento: 5 Solano: 4
Calaveras: 1 Marin: 8 San Benito: 2 Sonoma: 4
Colusa: 6 Mendocino: 5 San Bernardino: 18 Tehama: 7
Contra Costa: 11 Merced: 5 San Diego: 36 Trinity: 10
Del Norte: 3 Modoc: 5 San Joaquin: 1 Tulare: 7
El Dorado: 22 Mono: 27 San Luis Obispo: 29 Tuolumne: 8
Fresno: 7 Monterey: 28 San Mateo: 16 Ventura: 5
Humboldt: 19 Napa: 2 Santa Barbara: 12 Yolo: 4
Imperial: 1 Nevada: 4 Santa Clara: 3 Yuba: 5
Inyo: 19 Orange: 9 Santa Cruz: 3
Kern: 8 Placer: 9 Shasta: 15

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).