Japan Flora: Perennial; culms 60-100 cm. long, erect, with 5- to 7-nodes; leaf-blades grayish green, rather flat, 20-40 cm. long, 7-15 mm. wide; sheaths short-pilose on the collar; ligules truncate, about 1 mm. long; panicles erect, linear, exserted, 15-30 cm. long, dense, long; glumes green, equal, broadly lanceolate, acute, smooth, glabrous, rounded on back; lemma about 12 mm. long, the awn stout, 25-30 mm. long, scabrous, 2-grooved on inner side; anthers linear, 7-8 mm. long, glabrous. Moun­tain woods.

Hokkaido, Honshu, Shikoku, Kyushu. The typical phase occurs in Korea and China.