Japan Flora: Culms 40-60 cm. long, tufted, acutely angled, scabrous above on the angles; leaf-blades 3-4 mm. wide, firm, the basal sheaths (at least the lower ones) bladeless, dark brown, more or less fibrous; spikes 4 or 5, contiguous, the terminal gynecandrous, about 3 cm. long, the lateral pistillate, with few staminate flowers at the base, 2.5-4 cm. long, the lower ones distant and peduncled, pendulous, the lower bracts 1 or 2, leaflike, elongate; pistillate scales oblong, ferrugineous, acute or subacute, mucronate; perigynia slightly longer and broader than the scales, 3-3.5 mm. long, brownish green, broadly elliptic, densely papillose, prominently 4- or 5-nerved, com­pressed-biconvex, abruptly very short-beaked, entire at the tip; stigmas 2.  May-June. Wet places.

Kyushu; rare.