Rhizome thick, woody. Culms tufted, 60-100 × 0.2-0.4 cm, trigonous, smooth. Leaves basal and cauline, longer than culms, flat, 8-15 mm wide, glabrous; persistent sheaths pale brown, fibriform. Involucral bracts leafy, longer than inflorescence branches, long sheathed. Panicle compound, 4-6-branched; inflorescence branches single, patent, loose, triangular-ovate, 5-8 × 4-5 cm; peduncles of inflorescence branches tenuous, trigonous, lowest one 12-14 cm, upper ones gradually shorter, smooth or upper part hairy; inflorescence axes trigonous, hairy on edges; bractlets glumelike, ca. 1 mm, membranous, glabrous, with awns 3-5 mm. Spikes numerous, bisexual, androgynous, arising from cladoprophylls, loose and patent, terminal one 10-20 mm, lateral ones 5-16 mm; male part of spike oblong, 1/5-1/3 length of female part; female part of terminal one 6-9-flowered, female part of lateral ones 4-7-flowered; male glumes pale green, lanceolate, 2.5-3 mm, membranous, apex acuminate, with awns 1-1.5 mm; female glumes pale yellowish white, ovate or oblong, 1-1.5 mm, membranous, apex rounded or emarginate. Utricles pale green, obliquely patent, much longer than glumes, ovate or rhomboid-ovate, trigonous, 4-4.2 mm, papery, many veined, apex attenuate into beak of medium length, orifice obliquely truncate. Nutlets brown at maturity, ovate or rhomboid-ovate, trigonous, ca. 2 mm; style base thickened and conic; stigmas 3.
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