Rhizome short, indurate. Culms tufted, 10-70 cm tall, trigonous, erect, stiff, clothed with brown-reddish sheaths at base. Lower involucral bracts leaflike, much surpassing inflorescence. Spicate inflorescence long cylindric or ovate-elliptic, 1.5-3.5 × 0.8-1.3 cm, dense at apex, lower 1 or 2 usually distant; spikes numerous, androgynous, ovate, 5-7 mm. Female glumes pale, light green at middle, ovate-lanceolate, 2.5-3 × 1.2-1.5 mm, membranous, apex acuminate, awned. Utricles pale green, longer than glume, ovate-lanceolate or oblong-elliptic, plano-convex, 3-3.5 × ca. 1.5 mm, membranous, glabrous, many veined on both faces, margins from middle to apex with narrow serrulate wings, apex gradually narrowed into a medium-sized beak, orifice 2-toothed. Nutlets pale brown, loosely enveloped, ovate or suborbicular, plano-convex, 1.3-1.5 mm, lustrous; stigmas 2. Fl. and fr. Jun-Sep.
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