Trisetum canescens
Tall false oat, Tall False Oat
(c) Peter Warner, some rights reserved (CC BY) · licence
Family: Poaceae · Type: Grass · Native
Trisetum canescens (Tall false oat) is a native California grass in the Poaceae family, recognized by tall stature, panicle-like inflorescence, and exposed central axis.
Tall false oat is a California native perennial found in northwestern California, the high Cascade Range, Sierra Nevada, central western California, San Jacinto Mountains, and Modoc Plateau in open to shaded sites including meadows, chaparral, and conifer forest at elevations below 2,830 meters. Flowering from May to August, this plant produces pale green to tan flowers in narrow, compact to open panicles 6 to 20 centimeters long. Growing in dense clumps with stems 50 to 80 centimeters tall, it develops erect to ascending stems that are glabrous or slightly scabrous. Its leaves are narrow, 2 to 5 millimeters wide, with ligules 1 to 4 millimeters long, and range from glabrous to sparsely hairy. The spikelets feature delicate lance-shaped glumes with awns 6 to 11 millimeters long, giving the plant a distinctive feathery appearance.
Identification and appearance
Key characters: 4 sympatric species; distinguished by tall stature, panicle-like inflorescence, and exposed central axis
Habitat and range
Habitat: Open to shaded sites, meadows, chaparral, conifer forest
Elevation: < 2830 m
California counties: Sonoma, Del Norte, Contra Costa, Humboldt, San Luis Obispo, Napa, Marin, Madera, Mono, Riverside, Plumas, Siskiyou, Fresno, Tuolumne, Mendocino, Tehama, Nevada, San Francisco, San Bernardino, Alameda, Butte, Inyo, Lassen, Mariposa, Tulare, Santa Clara, Placer, El Dorado, Amador, Modoc, Glenn, Sierra, Yuba, Kern, Monterey, San Mateo, Santa Cruz, Shasta, Trinity, Colusa, Santa Barbara, San Benito, Lake, Alpine
Outside California: to Alaska, Montana, Utah
Bloom period
Trisetum canescens blooms May-Aug.
How to tell it apart
vs Schismus: Trisetum has hairy spikelet axes extending beyond flowers; Schismus has no extension or hairs.; vs Koeleria: Trisetum has dull spikelets with wide-spaced flowers; Koeleria has shiny, compact spikelets.; vs Aira: Trisetum is perennial with hairy axis extensions; Aira is annual with no axis extension.; vs Vahlodea: Trisetum's axis extension is clearly hairy (1-2mm); Vahlodea's is nearly hairless and tiny.; vs Deschampsia: Trisetum has obviously hairy spikelet axes; Deschampsia's axes are smooth or barely hairy.
Frequently asked questions
Is Trisetum canescens native to California?
Yes. Trisetum canescens is native to California (recorded as native).
When does Trisetum canescens bloom?
Trisetum canescens blooms May-Aug.
Where in California does Trisetum canescens grow?
Trisetum canescens occurs in Sonoma, Del Norte, Contra Costa, Humboldt, San Luis Obispo, Napa, Marin, Madera and other counties, at elevations of < 2830 m.
What plant family does Trisetum canescens belong to?
Trisetum canescens is in the Poaceae family, genus Trisetum.
What habitat does Trisetum canescens grow in?
Trisetum canescens grows in Open to shaded sites, meadows, chaparral, 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.