Japan Flora: Rhi­zomes creeping, elongate, slender; culms few, 10-40 cm. long, with only a few sheaths at the base; leaves of sterile fascicles with broadly lanceolate to lanceolate blades 1-3 cm. wide, thin, soft, glabrous or sparsely puberulent, scabrous on margins; spikes 4-8, androgynous, erect, short-cylindric, few-flowered, 1-2 cm. long, the bracts spathaceous, the sheath ampliate above, usually bladeless; pistillate scales oblong, obtuse, fre­quently brown-spotted; perigynia 3 nim. long, ellipsoidal, 3-angled, pale green, membranous, glabrous, slenderly nerved, the beak extremely short, with an entire tip; stigmas 3, slender, elongate. Apr.-May. Woods in mountains. 

Hokkaido, Honshu, Shikoku, Kyushu; rather common. Korea, Ussuri, Manchuria, and China.