Japan Flora: Tufted; culms 20-50 cm. long, slender; leaf-blades 1-2 mm. wide, thin, flat, nearly smooth; head solitary, denderly cylindric, 2-3 cm. long, ebracteate; spikes 3 or 4(-5), gynecandrons, obovoid, sub- globose at maturity, few-flowered, 3-5 mm. long, the lateral shorter than the terminal, the upper ones contiguous, the lower distant; pistillate scales pale, obtuse; perigynia about twice as long as the scales, ovate-oblong, 2.5-3 mm. long, unequally bi­convex, at first glaucous-green, brownish at maturity, rather thin-membranous, with elevated thick nerves, obtusely mar­gined, beakless, with an entire smooth tip; stigmas 2, June-July

Akan volcanic group in Hokkaido; rare. Korea, Sakhalin, Siberia, Europe, and Alaska.