Japan Flora: Rhizomes long-creeping; culms 30- 40 cm. long, glabrous, slender; leaf-blades flat, about 3 mm. wide, the basal sheaths brownish to stramineous, slightly fibrous; spikes 3, distant, the terminal staminate, 2.5-3 cm. long, the others pistillate, short-cylindric, peduncled, rather loosely flowered, 1.5-2 cm. long, the bracts short, long-sheath- ing; pistillate scales obovate, pale green, rounded to truncate and mucronate at apex; perigynia slightly longer than the scales, 3.5 mm. long, suberect, obovate-ellipsoid, nerved, pu­bescent, abruptly short-beaked, the apex 2-toothed; stigmas 3. Apr.-May. Open woods in hills.

Honshu (sw. Kanto Distr.); rather common.