Rhizome stoloniferous. Culms laxly tufted, 40-70 cm tall, triquetrous, smooth, clothed with red-brown and bladeless sheaths at base. Involucral bracts leafy, slightly shorter than inflorescence, sheathed, upper ones shortly sheathed or nearly not sheathed, lowermost one shortly sheathed, usually 5-10 mm. Spikes 4-7; terminal 2 or 3 spikes male, approximate, cylindric, 3-4 cm, nearly sessile; remaining spikes female, remote, cylindric, 2-5.5 × ca. 1 cm, densely many flowered, shortly pedunculate. Female glumes ferruginous, green at middle, lanceolate, ca. 5 mm, membranous, 1-3-veined, apex acuminate, aristate. Utricles olivaceous or brownish green, obliquely patent, longer than glume, lanceolate or oblong-lanceolate, obtusely trigonous, 6-7 mm, corky, glabrous, several veined, base subrounded, apex gradually narrowed to a slightly broad and short beak, orifice shortly 2-toothed. Nutlets slightly tightly enveloped in utricle, elliptic, trigonous, 2-3 mm, base stipitate, apex mucronate; style base not thickened; stigmas 3. Fl. and fr. Jun-Jul.
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