Juncus tenuis
Poverty or slender rush, Slender Rush
(c) Douglas Goldman, some rights reserved (CC BY-SA), uploaded by Douglas Goldman · licence
Family: Juncaceae · Type: Grass · Native
Juncus tenuis (Poverty or slender rush) is a native California grass in the Juncaceae family, recognized by distinctive sheath appendages and spreading flowers in fruit.
Poverty rush is a native perennial found in northwestern California, the Cascade Range, Sierra Nevada, Central Valley, Central Coast, San Gabriel Mountains, and Modoc Plateau in damp places at elevations generally below 1,500 meters. Flowering from late spring to summer, this rush produces green to reddish-brown flowers with delicate, narrow perianth parts. Growing in dense clumps with slender stems 20 to 60 centimeters tall, it forms soft, flexible clusters with thin, grass-like appearance. Its leaves are narrow, approximately 1 to 1.3 millimeters wide, with translucent sheath margins that have thin, acute appendages. The tiny seeds, measuring 0.4 to 0.5 millimeters long, contribute to this rush's delicate and understated character.
Identification and appearance
Key characters: 73 sympatric species; distinctive sheath appendages and spreading flowers in fruit
Habitat and range
Habitat: Uncommon. Damp places
Elevation: generally < 1500 m
California counties: Butte, Humboldt, Mendocino, Plumas, Shasta, Yuba, El Dorado, Los Angeles, Mariposa, Siskiyou, Trinity, Riverside, Nevada, Calaveras, Amador, Marin, San Francisco, Sacramento, Tehama, Placer, Solano, Alameda, Kings, Sutter, Glenn, Sierra, Modoc, Lassen, Del Norte, Santa Clara, Contra Costa, Fresno, Madera, Monterey, Ventura, Tuolumne, Sonoma, Lake, San Mateo, Stanislaus, Santa Cruz
Outside California: North America, introduced worldwide except Antarctica
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 tenuis native to California?
Yes. Juncus tenuis is native to California (recorded as native).
Where in California does Juncus tenuis grow?
Juncus tenuis occurs in Butte, Humboldt, Mendocino, Plumas, Shasta, Yuba, El Dorado, Los Angeles and other counties, at elevations of generally < 1500 m.
What plant family does Juncus tenuis belong to?
Juncus tenuis is in the Juncaceae family, genus Juncus.
What habitat does Juncus tenuis grow in?
Juncus tenuis grows in Uncommon. Damp places.
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.