Japan Flora: culms erect, slender, tufted, 20-50 cm. long; leaf-blades green, 1-3 mm. wide; ligules truncate, about 0.5 mm. long; panicles erect, open, loose, the branches 3- to 5-nate; spikelets 3-4 mm. long, ovate; glumes lanceolate, acuminate; lemmas oblong, acute, glabrous on the sides, with obscure intermediate nerves, 2-3 mm. long, pubescent on lower half of the keel and marginal nerves, the web sparse; anthers 1.2-1.5 mm. long. Mountain woods; Honshu (Kanto and centr.); rare. n. Korea, Kuriles, and cooler parts of the N. Hemisphere.