Japan Flora: Rhizomes relatively thick; culms few, tufted, 30-60 cm. long, acutely angled, nearly smooth; leaf-blades 3-5 mm. wide, nearly smooth, glaucous beneath, the basal sheaths bladeless, dark brown, fibrous; spikes 3 or 4, contiguous, erect, fastigiate, the terminal staminate, linear, ferrugineous, usually shorter than the succeeding ones, the lateral spikes pistillate, often with a short staminate portion at the apex, cylindric, 3-5 cm. long, the lowest one ped uncled, the lowest bract leaf like, much longer than the inflorescence; pistillate scales pale ferrugineous, narrowly oblong, membranous, rounded or mucronate; peri- gyna nearly as long as and much broader than the scales, 2.5-3 mm. long, much inflated, ovate-orbicular, brownish, membranous, faintly nerved, abruptly very short-beaked, en­tire at the tip; style flexuous, stigmas 2. Apr.-May. Wet river banks.

Honshu (Kanto Distr. and Owari Prov.)3 Kyushu (n. distr.); rare.  China.