Japan Flora: Rhizomes short; culms tufted, 40-60 cm. long, obtusely angled, smooth; leaf-blades 2-4 mm. wide; spikes 8-10, gyiwcandrous，narrowly oblong, pale, densely flowered, 8-15 mm. long, mostly aggregated into a slender head 5-10 cm. long, but the lower ones separate, the lower bracts elongated, leafy, much longer than the culm; pistillate scales pale, membranous, oblong; perigynia longer than the scales, 4-4.5 mm. long, compressed-planoconvex, faintly nerved, scabrous and narrowly winged on the mar­gins, gradually narrowed into a flat, very narrowly winged beak, the tip deeply 2-fid; stigmas 2.   May. Forests.

Hon­shu (Kinki Distr. and eastw.), Shikoku. China, Formosa, and Malaysia.