Japan Flora: Culms 2050 cm. long, gla­brous; leaf-blades glaucous-green, thick, sulcate above, nearly smooth, about 1.5 mm. wide, the basal sheaths light gray; spikes 2 or 3, distant, erect, the terminal staminate, linear, 2-3 cm. long, the lateral pistillate, ovoid-globose to oblong, rather densely flowered, 1-1.5 cm. long; lowest bract leaflike, sheathing; pistillate scales broadly ovate, acute, castaneous, paler and scari이is toward margin; perigynia longer than the scales, 5-5.5 mm. long, obliquely spreading, broadly ovoid, slightly turgid, rather coriaceous, grayish green and partially dark brown, glabrous, nerved, abruptly short-beaked, 2-toothed at tip; stigmas 3, short, June-Aug. Bogs and swampy places in lowlands.

Hokkaido, Honshu (Rikuchu and Shinano Prov.); rare.  s. Kuriles and e. N. America.