Japan Flora: Rhi­zomes loosely tufted, with short ascending innovations; culms densely matted, 10-50 cm. long, slender, acutely angled, very scabrous; leaf-blades flat, rather thin and soft, 1.5-3 mm. wide, the basal sheaths membranous, not fibrous, pale; spike solitary, terminal, usually androgynous, rarely monoecious, usually ob­long to narrowly so, the staminate part very short; pistillate scales oblong, castaneous, emarginate, the green midrib ex­current as a mucro; perigynia 6-8 mm. long including the stipe, nearly twice as long as the scales, suberect, moderately compressed, tawny, faintly or obsoletely nerved, lustrous, the beak very shallowly 2-toothed, with a hyaline tip; stigmas 3.   July-Aug. Wet alpine slopes.

Hokkaido, Honshu (n. and centr. distr.); rather rare. Kuriles.