Rhizome short, subwoody. Culms 5-30 cm tall, erect, slender, rigid, acutely trigonous, smooth, ± curving above, clothed at base with brown sheaths disintegrating into parallel fibers. Leaves shorter than culm, blades linear, 2-3 mm wide, flat or plicate, margins scabrous, apex acuminate. Lowest involucral bracts setaceous, sheathless, upper glumelike, dark brown. Spikes 2-5, erect, approximate; terminal spike (rarely 2) male, narrowly oblong or oblanceolate, 20-25 × ca. 3.5 mm; lateral spikes female, sometimes bearing several male flowers at apex, narrowly oblong or shortly cylindric, 15-25 × 4-5 mm, densely many flowered, lowest spike with peduncle, upper subsessile. Female glumes dark brown or castaneous, ovate-oblong, ca. 2.5 mm, with yellowish green midrib, apex obtuse. Utricles dark brown above, pale below, broader and slightly longer than glume, broadly ovate or suborbicular, plano-convex, 2.5-2.8 × ca. 1.5 mm, glabrous, ± nerveless, base shortly stipitate, apex rounded, with erect beak, orifice irregular truncate. Nutlets red-brown, tightly enveloped, obovate-orbicular, ca. 1.5 mm; style base not thickened; stigmas 2. Fr. Jun.
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