Japan Flora: Rhizomes elongate, long-creeping, with yellow-tomentose, thick roots; culms 20-40 cm. long; leaf-blades 1.5-2.5 mm. wide, cinereous-green, the sheaths reddish brown; spikes 2 or 3, distant, the terminal staminate, linear, 2-2.5 cm. long, on an erect peduncle, dark tawny, the others pistillate or rarely with a short terminal staminate portion, ovoid or oblong, 15-20 mm. long, pendulous on long setaceous peduncles, the lowest bract bristlelike, erect; pistillate scales ovate, acute, sharply mucro­nate, copper-brown; perigynia narrower and slightly shorter than the scales, elliptic, 3.5-4 mm. long, glaucous-green, com­pressed-triangular, several-nerved, densely puncticulate, abruptly very short-beaked, with a ferrugineous emarginate tip; achene compressed-trigonous; stigmas 3.  June-Aug. Sphagnum bogs.

Hokkaido, Honshu (Tajima Prov. and eastw.); rather common. Widely distributed in bogs in the N. Hemisphere.