Perennial with short rhizome. Stems tufted, very slender but rigid, erect, subterete, striate, smooth, leafy, not rarely branched in the lower part, 10-40 cm by ½-⅔ mm. Leaves filiform, rigid, canaliculate, scaberulous on the margins, up to 1 mm wide; sheaths dark purple, not bearded at the mouth, those of the cauline leaves narrowly tubular, up to 2½ cm long. Inflorescence racemose, narrow, very loose, 6-10(-15) cm long, consisting of 3-4 fascicles of branches. Bracts similar to the leaves, the lower ones long, overtopping the inflorescence. Branches 2-4 together, unequal, erect, compressed, scaberu-lous, each bearing 1 spikelet. Spikelets oblonglanceolate, acute, glabrous, (1-)2-flowered, purple, 5-8 by 1½-2 mm. Glumes 5-6(-7), narrowly lanceolate, acutish, with scaberulous keel, the fertile ones 4-6 mm long, the lower 4 empty, smaller. Bristles 6, capillary, antrorsely scabrous, from somewhat shorter than to slightly overtopping the nut, usually c. 3 mm long. Stamens 3, anthers yellow, 2-3 mm long, with distinctly (c. ⅓ mm) produced connective. Style 3-5 mm long; stigmas 3, about as long as the style. Nut trigonous, oblongellipsoid or oblong-obovoid, 3-ribbed, apiculate, minutely scrobiculate, whitish to stramineous, 1½-2 by c. 4/5-1 mm.
On banks of streams, wet rocks, damp grassy slopes, in swamps, open grasslands, swampy places in the mossy forest, 1500-4000 m.
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