Plants gray-green. Rhizome very long. Culms 30-50 cm tall, acutely trigonous, scabrous, clothed with dark purple bladeless sheaths at base. Leaves equaling or longer than culm, blades linear, 2.5-5 mm wide, flat, scabrous. Involucral bracts glumelike. Spicate inflorescence cylindric, 3.5-4.5 cm; spikes 8-14, ovate or oblong, 5-10 mm, male spike in middle, upper and lower spikes androgynous or spikes entirely androgynous (rarely lowest female). Female glumes pale brown, oblong-ovate, greenish costa 1-veined. Utricles pale yellowish brown-green, longer than glume, obovate-oblong, plano-convex, 5-5.5 mm, distally verruculose and sparsely hirsute on both faces, abaxially 7-9-veined, adaxially faintly veined or nerveless, base cuneate, shortly stipitate, upper margins narrowly serrate winged, apex gradually attenuate into a long beak, orifice 2-toothed. Stigmas 2. Fr. Jun.
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