Japan Flora: Rhizomes slender, long-creeping; culms 10-15 cm. long, erect, glabrous, slender, somewhat firm; leaf-blades sul­cate above, about 1 mm. wide, shorter than the culm; spike solitary, terminal, androgynous, oblanceolate at anthesis, 6-8 mm. long, loosely flowered, composed of 2-3 staminate and 2-4 pistillate flowers; pistillate scales caducous at maturity, lanceo­late, rather acute, light ferrugineous; perigynia longer than the scales, 6-6.5 mm. long, at first appressed, reflexed at maturity, linear-lanceolate, slenderly many-nerved, light green, thick membranous, gradually long-beaked, glabrous, entire, truncate at tip; stigmas 3, short. June-July. High moors.

Hok­kaido, Honshu (Mount Naeba in Echigo, Mount Adzuma in Iwashiro, Oze in Shimotsuke and elsewhere); rare. Kuriles, Sakhalin, and widely distributed in the N. Hemisphere.