Japan Flora: Rhi­zomes short; culms slightly tufted, 25-50 cm. long, sulcate, slender, the upper sheaths 3-10 cm. long, stramineous; spike­lets narrowly ovoid to broadly lanceolate, 7-12 mm. long, 3-4 mm. thick, acute to acuminate, dark golden-brown, lustrous; scales narrowly ovate, 5-6 mm. long; achenes obovate, obtusely 3-angled, 3 mm. long, white, narrowed at base, puncticulate, with an annular apical disc, the style-base depressed-trigonous, the bristles 6, longer than the achene, retrorsely scabrous; stigmas 3. June-July. Moors.

Hokkaido (Sarobetsu, Hamatombetsu), Honshu (Rikuchu Prov.), Yanagisawa; rare. s. Kuriles and Kamchatka.