Japan Flora: Rhizomes densely tufted; culms 50-70 cm. long, acutely 3-angled, promi­nently scabrous on the angles above; leaf-blades 2-4 mm. wide, the basal sheaths bladeless, lustrous, dark brown, fibrous; spikes 3 or 4, approximate, the upper 】 or 2 staminate, linear, the lower 1 or 2 pistillate, cylindric, sessile, 1-3 cm. long, the lowest bract leaflike, not longer than the inflorescence; pistil­late scales broadly lanceolate, dark castaneous, rather obtuse; perigynia broader than and nearly as long as the scales, 2.5 mm. long, turgid, biconvex, nerveless, minutely punctate, brownish, abruptly and very shortly beaked, with an entire tip; stigmas 2. Sphagnum bogs.

Hokkaido; rare. e. Si­beria, n. Korea, Sakhalin, Kamchatka, and Kuriles.