Distribution: British Columbia south on both sides of the Cascades to California, east to Montana and New Mexico.
Habitat: Lake margins, stream banks, moist mountain meadows and other wet areas.
Flowers: May - July
Conservation Status: Not of concern
Strongly rhizomatous perennials, the culms 1-1.5 m. tall.
Sheaths closed to near the top, slightly scabrous; ligules 3-6 mm. long, truncate, puberulent; blades flat, 6-10 mm. broad.
Inflorescence a loose, open panicle 15-25 cm. long, the branches spreading; spikelets 4- to 7-flowered, ovate in outline; glumes papery, 1-nerved, the first about 1 mm. long, the second, 1.5 mm. long; lemmas 2-2.3 mm. long, 7-nerved to the scarious upper margin, the nerves non-convergent; paleas about equal to the lemmas, minutely cleft at the tip; stamens 2.