Rhizome woody, stoloniferous. Culms tufted, 40-50 cm tall, slender, clothed at base with reddish brown sheaths. Leaves subequaling culm, blades linear, 5-7 mm wide, flat, scabrous above. Involucral bracts leaflike, longer than inflorescence, long sheathing. Spikes numerous, 2-5 at each node on 5 or 6 nodes, all spaced, upper 3-6 spikes male, lower spikes usually female, occasionally becoming androgynous, linear-cylindric, 2-3.5 cm, loosely flowered, with slender peduncles. Female glumes sanguineous-red, oblong, 4-4.5 mm, margins broadly hyaline, yellowish green 3-veined costa forming a short awn at apex, apex subrounded or emarginate. Utricles green, almost longer than glume, ovate-rhomboid, trigonous, 5-7 mm, membranous, glabrous, finely veined, base shortly stipitate, apex gradually narrowed into a scabrous long beak, orifice shortly 2-toothed. Nutlets brown, elliptic, 2.8-3 mm; style base thickened; stigmas 3. Fl. and fr. Jul.
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