Rhizome short. Culms tufted, 40-60 cm tall, slender, acutely trigonous, clothed at base with brown bladeless sheaths. Leaves short or longer than culm, blades linear, 3-5 mm wide, flat. Lowest involucral bract leaflike, surpassing inflorescence, sheathless, remaining bracts setaceous. Spikes 4 or 5, gynaecandrous, oblong or oblong-cylindric, 15-30 × 5-6 mm, densely many flowered, upper 3 or 4 approximate, lowest one distant, with long and slender peduncle, pendent. Female glumes dark purple, lanceolate, 2.8-3 mm, green 3-veined costa excurrent into a scabrous long awn. Utricles yellow-green, longer than glume, long ovate, 3-3.5 mm, membranous, biconvex, subpapillose, nerveless except for 2 costas on edges, base subrounded, shortly stipitate, emarginate, apex abruptly contracted into a short beak, orifice entire. Nutlet obovate or subglobose, 1.8-1.9 mm; style curved, base not thickened; stigmas 2. Fl. and fr. Jul.
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