Juncus mexicanus
Mexican rush
Photo by Chez Brungraber
Family: Juncaceae · Type: Grass · Native
Juncus mexicanus (Mexican rush) is a native California grass in the Juncaceae family, recognized by distinctive spirally twisted stems and lateral-appearing inflorescence.
Mexican rush is a California native perennial found in coastal and montane meadows at elevations up to 3,800 meters. Flowering with white to brown-tinged flowers, this rush produces small clusters with variable midstripe intensity and scarious margins. Growing 10 to 60 centimeters tall with a heavy rhizome, it develops erect or spirally twisted stems that are slender and flattened. Its basal leaves have loose sheaths, with some upper sheaths bearing blades up to 20 centimeters long that resemble the stem itself. The fruit is ovoid and three-angled, with a tiny beak less than half a millimeter long.
Identification and appearance
Key characters: 76 sympatric species; distinctive spirally twisted stems and lateral-appearing inflorescence
Habitat and range
Habitat: Common. Coast to montane meadows
Elevation: < 3800 m
California counties: Los Angeles, Mono, San Bernardino, Fresno, Kern, Riverside, San Diego, Butte, Glenn, Inyo, Lake, Marin, Mariposa, Monterey, Sacramento, Santa Clara, Shasta, Siskiyou, Sonoma, Tulare, Alpine, Contra Costa, Lassen, Madera, Plumas, Tuolumne, Ventura, Orange, Santa Barbara, San Luis Obispo, El Dorado, Sierra, Sutter, Modoc, Santa Cruz, Nevada, Amador, Solano, Alameda, Merced, San Joaquin, Humboldt, Placer, Colusa, Napa, San Benito
Outside California: to southern Oregon, New Mexico, Central America, South America
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 mexicanus native to California?
Yes. Juncus mexicanus is native to California (recorded as native).
Where in California does Juncus mexicanus grow?
Juncus mexicanus occurs in Los Angeles, Mono, San Bernardino, Fresno, Kern, Riverside, San Diego, Butte and other counties, at elevations of < 3800 m.
What plant family does Juncus mexicanus belong to?
Juncus mexicanus is in the Juncaceae family, genus Juncus.
What habitat does Juncus mexicanus grow in?
Juncus mexicanus grows in Common. Coast to montane meadows.
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.