Lipocarpha occidentalis
Western halfchaff sedge
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Family: Cyperaceae · Type: Grass · Native
Lipocarpha occidentalis (Western halfchaff sedge) is a native California grass in the Cyperaceae family, recognized by higher elevation, spherical spikes, and smallest fruits 0.5-0.6mm.
Western halfchaff sedge is a California native annual found in northern Coast Ranges, Sierra Nevada, and Peninsular Ranges in wet soil and emergent shorelines at elevations of 1,200 to 1,900 meters. Flowering from June to August, this delicate sedge produces tiny, compact spikes with light brown fruits. Growing with diminutive stems just 1 to 7 centimeters tall, it forms dense, nearly spherical inflorescences. Its fine flowering bracts have short awns approximately 1 to 1.5 millimeters long, with fruit surfaces that are delicately pitted and widest near the tip. The fruits are light brown, less than one millimeter wide, with gently convex surfaces.
Identification and appearance
Key characters: 2 sympatric species; distinguished by higher elevation, spherical spikes, and smallest fruits 0.5-0.6mm
Habitat and range
Habitat: Wet soil, especially emergent shorelines
Elevation: 1200-1900 m
California counties: Mariposa, Siskiyou, Tuolumne, Kern, El Dorado, Nevada, Fresno, Riverside, Tulare, Humboldt, Merced, Trinity, Calaveras, San Bernardino, Lake, Los Angeles, San Diego, Glenn, Butte, Sacramento, Alpine
Outside California: to Washington
Bloom period
Lipocarpha occidentalis blooms Jun-Aug.
How to tell it apart
vs Eleocharis: Lipocarpha has leaf-like bracts at base of clusters, Eleocharis completely lacks bracts below spikelet.; vs Isolepis: Lipocarpha has multi-veined outer bracts, Isolepis bracts have single midvein.; vs Trichophorum: Lipocarpha is tiny annual in mud, Trichophorum is perennial in bogs with bristly seeds.; vs Amphiscirpus: Lipocarpha grows in wet mud along shores, Amphiscirpus grows submerged in deeper water.; vs Schoenoplectus: Lipocarpha is tiny annual under 16 inches, Schoenoplectus is typically much taller perennial.
Frequently asked questions
Is Lipocarpha occidentalis native to California?
Yes. Lipocarpha occidentalis is native to California (recorded as native).
When does Lipocarpha occidentalis bloom?
Lipocarpha occidentalis blooms Jun-Aug.
Where in California does Lipocarpha occidentalis grow?
Lipocarpha occidentalis occurs in Mariposa, Siskiyou, Tuolumne, Kern, El Dorado, Nevada, Fresno, Riverside and other counties, at elevations of 1200-1900 m.
What plant family does Lipocarpha occidentalis belong to?
Lipocarpha occidentalis is in the Cyperaceae family, genus Lipocarpha.
What habitat does Lipocarpha occidentalis grow in?
Lipocarpha occidentalis grows in Wet soil, especially emergent shorelines.
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.