Japan Flora: culms 12-17 cm. long, obtusely angled, smooth; leaf-blades short, sulcate, 1- 1.5 mm. wide, rather thick, somewhat obtuse; spike solitary, terminal, unisexual or rarely androgynous, 15-25 mm. long, somewhat lustrous; pistillate scales ovate, yellowish brown, obtuse, 1-nerved; perigynia conspicuously longer than the scales, about 2.5 mm. long, obliquely spreading at tip, yellow­ish brown, faintly nerved, biconvex, gradually rather long beaked, the tip hyaline. June-July. High moors.

Hok­kaido (Daisetsu-zan); rare. Sakhalin.