Juncus confusus
Colorado rush
(c) Matt Berger, some rights reserved (CC BY), uploaded by Matt Berger · licence
Family: Juncaceae · Type: Grass · Native
Juncus confusus (Colorado rush) is a native California grass in the Juncaceae family, recognized by . Key features: thread-like leaves, no crosswalls, large ovate bractlets.
Colorado rush is a California native perennial found in the Klamath Ranges, northern Coast Ranges, high Cascade Range, northern and central Sierra Nevada, and Warner Mountains in meadows within conifer forest at elevations of 1,200 to 2,000 meters. Flowering in summer, this plant produces small straw-colored flowers with dark lateral stripes in compact clusters. Growing with slender, light green stems 30 to 50 centimeters tall, it forms dense tufted clumps characteristic of cespitose perennials. Its basal leaves are thread-like, less than two-thirds the stem length, with inrolled margins and thin white sheath appendages measuring 0.2 to 1 millimeters long. The fruit is an oblong capsule with three chambers, slightly shorter than the perianth and deeply notched at the tip.
Identification and appearance
Key characters: 45 sympatric species. Key features: thread-like leaves, no crosswalls, large ovate bractlets
Habitat and range
Habitat: Meadows in conifer forest
Elevation: 1200-2000 m
California counties: Lassen, Sierra, Tuolumne, Alpine, El Dorado, Mono, Plumas, Siskiyou, Nevada, Amador, Modoc, Trinity, Placer, Humboldt, San Mateo, Shasta, Lake, Mariposa
Outside California: to western Canada, South Dakota, Colorado, New Mexico
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 confusus native to California?
Yes. Juncus confusus is native to California (recorded as native).
Where in California does Juncus confusus grow?
Juncus confusus occurs in Lassen, Sierra, Tuolumne, Alpine, El Dorado, Mono, Plumas, Siskiyou and other counties, at elevations of 1200-2000 m.
What plant family does Juncus confusus belong to?
Juncus confusus is in the Juncaceae family, genus Juncus.
What habitat does Juncus confusus grow in?
Juncus confusus grows in Meadows in conifer forest.
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.