Japan Flora: Culms tufted, 30-50 cm. long, scabrous above; leaf-blades 3-5 mm. wide, the basal sheaths bladeless, brownish crimson; spikes 4-6, approximate, the terminal staminate or androgy­nous, the lateral pistillate or with a few staminate flowers at the apex, oblong or ovoid, 15-2.5 cm. long, densely many- flowered, erect or the lower nodding on a rather long peduncle, the lower bracts leaflike; pistillate scales narrowly ovate, dark purplish brown, acute; perigynia longer and broader than the scales, 4-5 mm. long, oval, much appressed, thin-membranous, glabrous, with 2 spinulose-scabrous, slender mar^nal nerves, othen신se nerveless, abruptly and very short- beaked, the tip minutely 2-toothed; achenes very small; stigmas 2. June-Aug. Subalpine regions, especially in wet gravelly places in volcanoes.

Honshu (n. distr.).