Japan Flora: Culms scabrous on the angles, at lease in the upper part, and the leaves distinctly scabrous, the basal sheaths dark brown; spikes 5 to 7, 3-10 cm. long, on scabrous peduncles; pistillate scales obovate, pale, truncate or rounded, the 3-nerved midrib end­ing in a small mucro; perigynia nearly twice as long as the scales, 2-2.5 mm. Jong, not turgid, nearly nerveless；May-June. Wet slopes.

Hokkaido, Honshu, Shikoku, Kyushu; rather common.