Juncus occidentalis
Western rush, Western Rush
(c) Barbara Banfield, some rights reserved (CC BY) · licence
Family: Juncaceae · Type: Grass · Native
Juncus occidentalis (Western rush) is a native California grass in the Juncaceae family, recognized by flowers arranged singly rather than in clusters.
Western rush is a California native perennial found in northwestern California, the Cascade Range, northern and central Sierra Nevada, Sacramento Valley, central western California, southern California coastal areas, western Transverse Ranges, and Peninsular Ranges at elevations below 2,400 meters in moist, generally sunny areas. Flowering from late spring through summer, this rush produces small green to brown-striped flowers with delicate scarious margins. Growing in dense tufts 30 to 60 centimeters tall with stiff, upright stems, it forms compact clumps in moist habitats. Its basal leaves are narrow, approximately 1 to 1.5 millimeters wide, with flat sides oriented toward the stem and no visible crosswalls. The fruit is dark brown, three-angled, and less than three-quarters the length of the perianth, with a truncate or notched tip.
Identification and appearance
Key characters: 71 sympatric species; flowers arranged singly rather than in clusters
Habitat and range
Habitat: Moist generally sunny areas
Elevation: < 2400 m
California counties: Mendocino, San Luis Obispo, Los Angeles, Shasta, Humboldt, Lake, Mono, Napa, San Bernardino, Santa Cruz, Siskiyou, Sonoma, Sierra, Del Norte, El Dorado, Glenn, Marin, Monterey, Nevada, Plumas, San Francisco, San Mateo, Santa Barbara, Santa Clara, Trinity, Tuolumne, Contra Costa, Tehama, San Diego, Butte, Amador, Yuba, Sacramento, Placer, Sutter, Lassen, Solano, Mariposa, Alameda, Madera, Colusa, Fresno, Alpine, Ventura, Kern
Outside California: to British Columbia, northern Baja California
How to tell it apart
vs Schoenoplectus: Juncus has leaf blades present; Schoenoplectus is leafless with only bladeless sheaths at base.; vs Carex: Juncus has round or flattened stems; Carex has triangular stems you can feel.; vs Luzula: Run finger along leaf edge - smooth = Juncus, hairy = Luzula.; vs Elegia: Juncus has small individual flowers; Elegia has showy papery bracts and branching structure.; vs Cyperus: Juncus has round stems and capsules; Cyperus has triangular stems and lens-shaped achenes.
Frequently asked questions
Is Juncus occidentalis native to California?
Yes. Juncus occidentalis is native to California (recorded as native).
Where in California does Juncus occidentalis grow?
Juncus occidentalis occurs in Mendocino, San Luis Obispo, Los Angeles, Shasta, Humboldt, Lake, Mono, Napa and other counties, at elevations of < 2400 m.
What plant family does Juncus occidentalis belong to?
Juncus occidentalis is in the Juncaceae family, genus Juncus.
What habitat does Juncus occidentalis grow in?
Juncus occidentalis grows in Moist generally sunny areas.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · Index of California Plant Names · CalPhotos
Last updated 2026-10-07
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.