Japan Flora: Plant densely tufted, short-rhizomatous; culms 20-40 cm. long, glabrous, slender, nod­ding above; leaf-blades soft, thin, flat, 2.5-35 mm. wide, the basal sheaths pale or the lower ones small, scalelike and dark brown; spikes 3-5, the terminal staminate, linear, the lateral pistillate, short-cylindric, 15-40 mm. long, sessile, or the lowest one peduncled, nodding, the lowest bract not over­topping the culm, not sheathing; pistillate scales small, ovate, dark brown or dark purplish brown; perigynia 2 or 3 times as long as the scales, lanceolate, 4-5 mm. long, obsoletely angled, light or pale green, thinly membranous, faindy nerved, gradually long slightly recurved-beaked, with an entire mem­branous tip; achenes small, obovate-orbicular; style rather long, the stigmas short, 3-fid.   Along streams in low mountains.

Hokkaido (sw. distr.), Honshu, Shikoku, Kyushu; common.