Japan Flora: Plant loosely tufted; culms soft, 30-50 cm. long, glabrous; leaf­blades flat, flaccid, 3-7 mm. wide, grayish green, the basal sheaths stramineous, short-bladed; spikes 2 or 3, widely distant, the terminal staminate, narrowly lanceolate, 1.5-3 cm. long, long-peduncled, ferrugineous, the lateral pistillate, oblong, long-peduncled, pendulous, the bracts short-bladed, long- sheathing; pistillate scales elliptic, rounded and mucronate, ferrugineous; perigynia longer than the scales, 5-6 mm. long, erect, ovoid-fusiform, 3-angled, grayish brown, puncticulate, faintly nerved, dull, glabrous, rather gradually long-beaked, with a truncate tip; stigmas 3. June-July. Wet places.

Hokkaido, Honshu (n. distr. sou th w. to Shimotsuke, Hitachi, and Shinano Prov.), Kyushu; rare. Korea and Ussuri.