Japan Flora: Rhizomes elongate, rather stout; culms 30-60 cm. long; leaf-blades flat, 1-5 mm. wide, glabrous, the basal sheaths bladeless, somewhat reddish brown, splitting into fibers; upper 2-4 spikes stami- nate, linear, 15-30 mm. long, reddish brown, the lower 2 or 3 pistillate, short-cylindric, 2-4 cm. long, the lower one or more peduncled, the lower bracts leaHike, sheathless; pistillate scales narrowly ovate, acute, sanguineous; perigynia longer than the scales, 3-4 mm. long, ascending, obtusely 3-angled, broadly obovoid, membranous, hispid, abruptly rather long- beaked, acutely 2-toothed; stigmas 3. May-June. Sandy or wet clay soil along rivers and streams.

Hokkaido, Honshu (Kinki Distr. and eastw.), Kyushu.