Japan Flora: more slender; culms tufted, 30-50 cm. long, sharply angled, scabrous; leaf-blades thin, 1-2 mm. wide; inflorescence often more or less flexuous, 3-10 cm. long; spikes 4-7, gynecandrous, ovoid-globose, 4-6 mm. long, pale green, the lower ones widely separate; pistillate scales ovate, thin, pale; perigynia longer than the scales, nearly erect, about 3 mm. long, ovate-lanceolate, planoconvex, faintly nerved, the mar­gins narrowly winged, not spongy, gradually long-beaked, deeply 2-toothed at the tip; stigmas 2.  June-July. Forests;

Hokkaido, Honshu (Mount Kirigamine in Shinano); rareKorea, Ussuri, and Sakhalin.