Japan Flora: Plant densely tufted; culms 40-80 cm. long, acutely angled, scabrous on the angles above; leaves with flat blades 4-10 mm. wide, the basal sheaths bladeless, dark cinnamon-brown, slightly to scarcely splitting into fibers ventrally; spikes 4 to 6, approxi­mate, pendulous, cylindric, 3-6 cm. long, peduncled, all or the upper ones gynecandrous, the others pistillate, the lower 2 or 3 bracts leaflike, much longer than the culms; pistillate scales narrowly obovate, with short ferrugineous striations, emargi­nate, the midrib 3-nerved, prolonged into an erect awn; perigynia longer than the scales, broadly ovate, 2.5-3 mm. long, compressed, nerveless, densely papillose, brownish when dry, abruptly very short-beaked, with a ferrugineous entire tip; stigmas 2. May-June. Wet fields in lowlands.

Honshu, Shikoku, Kyushu; common；Korea, China, Ryukyus, and Indochina.