Rhizome shortly creeping, stout, woody. Stems loosely tufted, triquetrous, smooth, 40-100 cm by 2-3 mm, the base clothed with membranous, pale or fuscous bladeless sheaths or their fibrous remains. Leaves herbaceous, subbasal and a few higher on the stem, equalling to much longer than the stems, linear-lanceolate, long-attenuate, tapering below (often into a pseudo-petiole), flat, light green, scabrid on the margins, 1.5-3 cm wide. Inflorescence a pale, compound, erect, much interrupted, 15-40 cm long panicle; secondary panicles 2-6, single at the nodes, erect, pyramidal, loose, 3-7.5 by 1½-5 cm, upper continuous, lower (when more than 2) distant, on exserted, hispidulous peduncles; rachis densely whitish hispid. Lower bracts foliaceous, exceeding the inflorescence, long-sheathing, upper reduced. Spikelets androgynous, subsessile, patulous, rather few-flowered, 5-10 mm long, male and female parts about equal in length. Glumes ovate or oblong-ovate, thinly membranous, obtuse or slightly emarginate, slenderly nerved, ciliolate at least at the top, otherwise glabrous or minutely adpressed-hispidulous, pale stramineous to light brown, 2-3 mm long, the midnerve excurrent in an antrorsely scabrid, 0.5-2 mm long awn. Utricles distinctly trigonous, ellipsoid with prominent angles and flattish faces, membranous, not inflated, patulous, many-nerved (nerves c. 5 on each face), glabrous or very sparsely hispidulous, rounded at the base, straight or slightly recurved, subabruptly beaked, 4-5(-6) by 1.5-1¾ mm; beak sparsely scabrid on the margins, or smooth, 1.5-2(-3) mm long, bidenticulate on the ventral side, with very oblique mouth. Nut triquetrous, ellipsoid-rhomboid, not cuneate at the base, erostrate, dark brown with yellowish angles, 2.5-2¾ by 1.5-1.8 mm. Style-base pyramidally thickened, subpersistent on the nut. Stigmas 3.
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Rhizome thick. Culms tufted, erect and robust, 30-100 × 0.3-0.5 cm, trigonous, smooth. Leaves basal and cauline, linear, 2-2.5 cm wide, glabrous or slightly scabrid; persistent sheaths brown, fibriform. Involucral bracts leafy, longer than inflorescence, long sheathed. Panicle simple or compound, 25-30 cm, 1-5-branched; inflorescence branches single, ovate-triangular, 4-10 × 2-6 cm, sometimes binate; peduncles of inflorescence branches rigid, upper part hairy, trigonous, lowest one 10-20 cm, upper ones gradually shorter; inflorescence axes trigonous, hairy on edges; bractlets glumelike, 1-1.5 mm, hairy abaxially, with awns 2-5 mm. Spikes numerous, bisexual, androgynous, arising from abaxially hairy cladoprophylls, 7-18 mm; male part of spike suboblong, 6-7 × 2-3 mm, usually longer than or sometimes as long as female part; female part elliptic, many flowered; male glumes pale yellow or pale brown, narrowly lanceolate, 6-7 mm, membranous, hairy abaxially, apex shortly awned; female glumes pale yellowish white, pale greenish white, or pale brown, lanceolate, 4.5-5.5 mm, membranous, hairy abaxially, midrib extending into scabrid awn, apex acuminate or emarginate. Utricles pale brown or pale green, shorter than glumes, subrhomboid, bluntly trigonous, 5.5-10 mm, hairy, many veined, base stipitate, apex elongate into beak, beak to 2/3 length of utricle, orifice obliquely truncate. Nutlets brown at maturity, elliptic, trigonous, 3-3.5 mm; style base slightly thickened; stigmas 3.
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