Japan Flora: Culms tufted, 40-70 cm. long, firm, erect; leaf-blades flat, rather stiff, 4-6 mtn. wide, the basal sheaths (at least the lower ones) blade­less, partially reddish brown; spikes 4-6, approximate, the terminal staminate, linear, rarely gynecandrous and clavate, 1.5-3 cm. long,  somewhat inconspicuous, the others pistillate, oblong, 1.5-3 cm. long, 15-18 mm. across, erect-patent, densely many-flowered, subsessile, the lowest one sometimes long- peduncled and pendulous, the lowest bract leaflike, elongate, not sheathing; pistillate scales narrowly oblong, more or less emarginate and long-awned, pale, minutely ciliate at apex; perigynia 4 to 5 times as long as the scales, 6-9 mm. long, spreading, linear-lanceolate, compressed, yellowkh green, gla­brous, many-nerved, gradually very long-beaked, deeply bifur­cate at tip, the lobes needlelike, 1.5 mm. long, strongly di­vergent; stigmas 3.  May-July. Swampy places.

Hokkaido, Honshu (Kanto Distr.); local and rather rare. Korea, Manchuria, and Ussuri.