Japan Flora: Rhizomes slender, long-creeping; culms 30-60 cm. long, loose, scabrous, acutely angled; leaf-blades flat, 3-5 mm. wide, shorter than the culm; spikes several, unisexual or an­drogynous, oblong, 5-10 mm. long, aggregated into a short, cylindric, ebracteate spike often interrupted below; pistillate scales ovate, acute, yellowkh brown, with a broad green mid­rib; perigynia longer than the scales, 4-4.5 mm. long, reflexed at tip, flat, ovate, broadly winged and scabrous on the margin, sparsely appr效sed-pubescent, at least while young; style bifid. Coniferous woods.

Hokkaido, Honshu (Rikuchu Prov.) s. Kuriles, Sakhalin, Korea, and e. Siberia