Rhizome short. Culms tufted, 10-20 cm tall, slender, compressed trigonous, smooth, clothed at base with purple-red, bladeless sheaths disintegrating into fibers. Leaves shorter than culm, blades 1-1.5 mm wide, flat, margins scabrous. Involucral bracts leaflike, shorter than inflorescence, sheathing. Spikes 4 or 5; upper 2 or 3 male, approximate, linear-cylindric, 8-12 mm, sessile; remaining 2 or 3 spikes female, distant, narrowly cylindric, 8-12 mm, 5-7-flowered, with slender slightly scabrous peduncles. Female glumes ferruginous, broadly ovate, margins narrowly white hyaline, apex subacuminate. Utricles suberect, castaneous, lustrous, elliptic, trigonous, ca. 4 mm, longer than glume, glabrous, nerveless, base contracted, apex gradually attenuate into a scabrous long beak, orifice 2-toothed. Nutlets pale, tightly enveloped, elliptic, obtusely trigonous, ca. 2.2 mm; style base not thickened; stigmas 3. Fl. and fr. May-Jul.
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