Juncus covillei
Coville's rush
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Family: Juncaceae · Type: Grass · Native
Juncus covillei (Coville's rush) is a native California grass in the Juncaceae family, recognized by . Key features: wide flat-sided leaves, long creeping rhizome, leaves reaching inflorescence top.
Coville's rush is a California native perennial found in northwestern California, the Sierra Nevada, northern central Coast Ranges, San Francisco Bay Area, and Transverse Ranges in moist sandy places, montane forests, and along creekbanks at elevations of 300 to 3,000 meters. Flowering in summer, this rush forms dense tufts with slender green to brown stems reaching 5 to 25 centimeters tall. Growing from a long, creeping rhizome with flat basal leaves 2 to 4 millimeters wide, it develops compact clusters of small flowers with brown to green perianth parts. Its leaves typically extend to the top of the plant's inflorescence, with 0 to 2 cauline leaves present. The fruit is widely cylindric, dark in color, with a blunt or slightly notched tip that extends beyond the perianth.
Identification and appearance
Key characters: 71 sympatric species. Key features: wide flat-sided leaves, long creeping rhizome, leaves reaching inflorescence top
Habitat and range
Habitat: Moist sandy places, montane forest, creekbanks
Elevation: 300-3000 m
California counties: Los Angeles, Sierra, Siskiyou, Tuolumne, Calaveras, Glenn, Marin, Mariposa, Mendocino, Plumas, Sonoma, Trinity, Yuba, Del Norte, Humboldt, San Bernardino, El Dorado, Monterey, Butte, Lake, Madera, Placer, Tehama, Fresno, Napa, Colusa, Shasta, Mono, Ventura
Outside California: to British Columbia, Montana
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 covillei native to California?
Yes. Juncus covillei is native to California (recorded as native).
Where in California does Juncus covillei grow?
Juncus covillei occurs in Los Angeles, Sierra, Siskiyou, Tuolumne, Calaveras, Glenn, Marin, Mariposa and other counties, at elevations of 300-3000 m.
What plant family does Juncus covillei belong to?
Juncus covillei is in the Juncaceae family, genus Juncus.
What habitat does Juncus covillei grow in?
Juncus covillei grows in Moist sandy places, montane forest, creekbanks.
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.