Rhizome short. Culms tufted, 25-35 cm tall, slender, obtusely trigonous, rigid, smooth, clothed at base with brown sheaths. Leaves shorter than culm, blades linear, 1-2 mm wide, flat, soft. Lower involucral bracts leaflike, shorter than inflorescence, sheathing, upper ones glumelike. Spikes 7-13, upper ones fastigiate, with short peduncles, lower spikes slightly spaced, with long peduncles, sometimes lowest one subradical and distant, 20-30 × 1.5-2 mm; terminal spike male; lateral spikes female, erect, densely many flowered at base, subloosely flowered above. Female glumes ovate-oblong, 1.8-2.5 mm, green 1-veined costa scabrous and excurrent into a mucro at apex. Utricles stramineous-green, narrowly oblong, compressed trigonous, 4-4.8 mm, glabrous, several veined, gradually narrowed at both ends, orifice white hyaline, obliquely truncate, 2-toothed. Nutlets narrowly oblong, base long stipitate; style base not thickened; stigmas 3. Fl. and fr. Jun-Jul.
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