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Taxon  Report  
Juncus cooperi  Engelm.
Cooper's rush
Juncus cooperi is a perennial grasslike herb that is native to California, and also found elsewhere in western North America.
California Rare Plant Rank: 4.3 (limited distribution).
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
Observation Search
~164 records in California
yellowone or more occurrences
within a 7.5-minute quadrangle
DJJJASONAFMM

Bloom Period
Genus: Juncus
Family: Juncaceae  
Category: angiosperm  
PLANTS group:Monocot
Jepson eFlora section: monocot

Wetlands: Occurs usually in wetlands, occasionally in non wetlands

Communities: Alkali Sink, wetland-riparian

Name Status:
Accepted by JEF + CNPS + PLANTS

Information about  Juncus cooperi from other sources
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora

USDA PLANTS Profile (JUCO3)

Photos on Calflora

Photos on CalPhotos

Google Images

Photos on iNaturalist

ID Tips on PlantID.net

[Wikipedia] Habitat, Description: Juncus cooperi is a species of rush known by the common name Cooper's rush. It is native to the deserts of the southwestern United States and northern Mexico, where it grows in alkaline and saline soils such as those around salt marshes and desert springs. This is a perennial herb forming large clumps of erect stems up to about 80 centimetres tall from a thick rhizome and large root network. The bases of the stems are surrounded by sparse, small leaves, which are stiff and have sharp tips. The inflorescence is a cluster of brown, pale green, or straw-colored flowers accompanied by one bract which appears as an extension of the stem. (contributed by Mary Ann Machi)


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 05/19/2024).