Japan Flora: Rhizomes long-creeping; culms slender, 15-30 cm. long, nearly glabrous; leaf­blades flat, soft, 2-3 mm. wide; spikes 2-4, distant, erect, the terminal staminate, linear, 1-2 cm. long, the others pistillate, short-cylindric, on long-exserted peduncles 7-15 mm. long, the lowest one sometimes nearly radical, the bracts short, long- sheathing at base; pistillate scales obovate, pale, usually mu­cronate; perigynia longer than the scales, erect, obovoid to ob- ovoid-oblong, usually glabrous, usually with an abrupt erect beak, often scabrous on the margins, hyaline and minutely 2- toothed at apex; stigmas 3. Very polymorphic.  Bracts long-sheathing at base, with blades shorter than the spikes; perigynia longer than the scales, 3 mm. long, erect, glabrous, nerved.  May-July. Damp woods in mountains.

Hokkaido, Honshu (n. centr. distr.). Sakhalin and s. Kuriles.