Japan Flora: Densely tufted in large clumps; culms 30-50 cm. long, scabrous above on the angles; leaf-blades 2-4 mm. wide, rather stiff, the basal sheaths bladeless, dark brown, splitting ventrally into reticulate fibers; spikes 3 to 6, erect, contiguous except the lower, the terminal staminate, linear, the lateral pistillate, erect, cylindric, 2-5 cm. long, sessile ex­cept the often short-peduncled lowest one, the lowest bract leaflike, longer than the inflorescence; pistillate scales dark purplish brown, with a green midrib, 3-nerved, short-mucro­nate; perigynia slightly longer than the scales, 3.5나 mm. long, moderately apjwressed，nerveless, abruptly rather long- beaked, coarsely scabrous on the margins, the apex 2-toothed; stigmas 2；May-June. Along m이mtain streams; sw. Hok­kaido, Honshu, Shikoku, Kyushu. Korea and n. China.

var. scabrida Kuek. Spikelets slightly larger; perigynia scat- tered-spinose；Kyushu (Tsushima). Korea.