Carex densa
Dense sedge
(c) Dean Wm. Taylor, some rights reserved (CC BY) · licence
Family: Cyperaceae · Type: Grass · Native
Carex densa (Dense sedge) is a native California grass in the Cyperaceae family, recognized by very dense, dark inflorescence.
Dense sedge is a California native perennial sedge found in northwestern California, the Cascade Range, Sierra Nevada, Central Valley, Central Coast, San Francisco Bay Area, southern Coast Ranges, southern California, Transverse Ranges, southern California mountains, and Peninsular Ranges in seasonally wet meadows, springs, and shoreline habitats at elevations below 1,500 meters. This sedge forms dense, clustered tufts with flowering stems that typically exceed the leaf height. Growing with leaf blades 3 to 7 millimeters wide and often featuring cross-wrinkled sheaths with red dots, the plant produces multiple dense, continuous inflorescences 1.5 to 8 centimeters long. Its leaves have distinctive characteristics, with sheath fronts that may be marked with red dots and blade surfaces showing varied textures. The fruit is ovate to diamond-shaped, with a conic beak 0.8 to 2.2 millimeters long, typically serrate or ciliate at the tip.
Identification and appearance
Key characters: 138 sympatric species; key feature is very dense, dark inflorescence
Habitat and range
Habitat: At least seasonally wet meadows, springs, shores
Elevation: < 1500 m
California counties: Mendocino, Lassen, Alameda, Humboldt, Lake, San Mateo, Sonoma, Los Angeles, El Dorado, Marin, Napa, San Francisco, San Joaquin, Santa Clara, Santa Cruz, Siskiyou, Tehama, Tuolumne, Ventura, Fresno, Riverside, Kern, San Diego, Placer, Butte, Mariposa, Sutter, Trinity, Merced, Contra Costa, Amador, Madera, Modoc, Nevada, Tulare, Calaveras, Sierra, Monterey, San Benito, Del Norte, San Luis Obispo, Stanislaus, Yuba, Sacramento, Shasta, Colusa, Santa Barbara, Inyo, San Bernardino, Solano, Glenn
Outside California: to Washington
How to tell it apart
vs Juncus: Carex stems are triangular when rolled; Juncus stems are round and often hollow with partitions inside.; vs Cyperus: Carex has seeds in individual flasks; Cyperus has umbrella-like flower clusters with flattened ribbon-like spikes.; vs Plantago: Carex has triangular stems and brown/green spikelets; Plantago has round flower stalks and white/brown spike flowers.; vs Eleocharis: Carex has leaves along the stem; Eleocharis is nearly leafless with just one spikelet per stem.; vs Schoenoplectus: Carex has leafy stems and flask-enclosed seeds; Schoenoplectus has leafless round stems with exposed seeds.
Frequently asked questions
Is Carex densa native to California?
Yes. Carex densa is native to California (recorded as native).
Where in California does Carex densa grow?
Carex densa occurs in Mendocino, Lassen, Alameda, Humboldt, Lake, San Mateo, Sonoma, Los Angeles and other counties, at elevations of < 1500 m.
What plant family does Carex densa belong to?
Carex densa is in the Cyperaceae family, genus Carex.
What habitat does Carex densa grow in?
Carex densa grows in At least seasonally wet meadows, springs, shores.
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.