Oryzopsis hendersoni Vasey

Oryzopsis hendersoni Vasey, Contr. U. S. Nat. Herb. 1: 267. 1893
Oryzopsis exigua var. Hendersoni Jones, Contr. West. Bot. 14: 1 1. 1912. (Based on O. Hendersoni Vasey.)
Culms densely cespitose, scabrous, 10-40 cm. tall; leaves mostly basal, much shorter than the culms, the sheaths (especially the lower ones) broad, papery, glabrescent; ligule very short; blades subfiliform, involute, scabrous, firm, mostly less than 10 cm. long, the one or two culm blades 4-5 cm. long; panicles narrow, few-flowered, 5-12 cm. long, the few scabrous branches appressed or ascending, spikelet-bearing toward the ends, the lower single or in pairs, as much as 8 cm. long ; spikelets short-pediceled ; glumes abruptly acute, minutely scaberulous, rather distinctly 3-nerved, 5-6 mm, long; lemma glabrous, dark brown at maturity, about 4.5 mm. long; awn early deciduous, nearly straight, 6-10 mm. long.
Type locality: Clements Mountain, near North Yakima, Washington.
Distribution: Dry or gravelly soil, known only from Clements Mountain, Washington, and the Ochoco National Forest, Oregon.