Japan Flora: Tufted plant; culms 30-60 cm. long, acutely angled, scabrous above on the angles, firm; leaf-blades 3-5 mm. wide, rather flat, the basal sheaths bladeless, brownish to reddish, conspicuously fibrous-reticulate ventrally; spikes 4 or 5, ap­proximate or slightly distant, the terminal staminate, elongate- linear, 3-6 cm. long, the lateral pistillate, cylindric, 3-5 cm. long, the lower ones nodding to pendulous on long peduncles, the lower bracts leaf like; pistillate scales pale, often slightly brownish, narrowly oblong, acute; perigynia slightly longer than the scales, 2.5-3 mm. long, obovate, biconvex, nerveless, vivid green, glabrous, rather abruptly short-beaked with a hyaline emarginate tip; stigmas 2. May-June.  Bordering streams and in mountain ravines.

Hokkaido (sw. distr.), Hon­shu, Shikoku3 Kyushu; occasional.