Japan Flora: Rhizomes short; culms rather tufted or solitary, 80-150 cm. long, retrorsely scabrous on the upper part of the internodes and below the panicle; leaf-blades thin, flat, green, 20-30 cm. long, 5-10 mm. wide, scabrous; sheaths con­nate to above the middle, somewhat keeled on back, slightly retrorsely scabrous; ligules 1-3 mm. long; panicles large and open, to 30 cm. long, loosely flowered, the branches sub- verticillate, spreading, prominently scabrous; spikelets green, 3-7 mm. long, prominently flattened, 4- to 8-flowered; glumes scabrous, very acute, lanceolate, the lower 1-nerved, 2.5-3 nun. long, the upper 3-nerved, 3-3.5 mm. long; lemmas broadly lanceolate, keeled, 3.5-45 mm. long, acute, glabrous on the sides, with glabrous, distinct intermediate nerves, the keel and marginal nerves appressed-pubescent near base, the web short and scanty.  June-Aug. Woods in mountains.

Hokkaido, Honshu (as far west as Mount Ibuki in Omi Prov. in centr. distr.). s. Kuriles, Kamchatka, Sakhalin, and Ussuri.