Poa confinis
Beach blue grass
(c) Matt Berger, some rights reserved (CC BY) · licence
Family: Poaceae · Type: Grass · Native
Poa confinis (Beach blue grass) is a native California grass in the Poaceae family, recognized by distinctive coastal habitat and delicate rhizomatous habit.
Beach blue grass is a California native perennial found in the northern Coast Ranges in ocean beaches and stabilized dunes at elevations below 100 meters. Flowering from April to June, this delicate grass produces tawny-colored spikelets in compact clusters 1 to 5 centimeters long. Growing with slender rhizomes or stolons, it forms tufted clumps 7 to 30 centimeters tall with fine, firm leaves. Its narrow leaves are 1 to 2 millimeters wide, folded or tightly rolled, with upper surfaces often finely hairy on sterile stems. The grass produces small spikelets with glabrous or slightly cobwebby bases, creating a soft, delicate appearance in coastal environments.
Identification and appearance
Key characters: 24 sympatric species; distinctive coastal habitat and delicate rhizomatous habit
Habitat and range
Habitat: Ocean beaches, stabilized dunes
Elevation: < 100 m
California counties: Humboldt, Mendocino, Marin, Del Norte, Mariposa
Outside California: to southeast Alaska
Bloom period
Poa confinis blooms Apr-Jun.
How to tell it apart
vs Festuca: Poa has boat-shaped, keeled leaf tips; Festuca leaves are flat or rolled but never keeled like a ship's prow.; vs Melica: Poa has fine, narrow leaves with boat-shaped tips; Melica has wider, flat leaves without the distinctive keel.; vs Nassella: Poa leaves have boat-shaped tips you can feel; Nassella leaves roll inward and lack the keel.; vs Koeleria: Poa has cobwebby hairs at seed base and keeled leaf tips; Koeleria lacks both features.; vs Holcus: Poa has boat-shaped leaf tips; Holcus leaves are flat and soft-hairy without any keel.
Frequently asked questions
Is Poa confinis native to California?
Yes. Poa confinis is native to California (recorded as native).
When does Poa confinis bloom?
Poa confinis blooms Apr-Jun.
Where in California does Poa confinis grow?
Poa confinis occurs in Humboldt, Mendocino, Marin, Del Norte, Mariposa, at elevations of < 100 m.
What plant family does Poa confinis belong to?
Poa confinis is in the Poaceae family, genus Poa.
What habitat does Poa confinis grow in?
Poa confinis grows in Ocean beaches, stabilized dunes.
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.