Rhizome short. Stems tufted, erect, triquetrous, smooth, (10-)30-90 cm by 1-2 mm below, surrounded below the leaves by a few reddish bladeless sheaths. Leaves basal and 1-2 higher up the stem, shorter than to slightly exceeding the stem, flat, smooth except for the minutely scaberulous margins, long-attenuate, 2-8 mm wide. Spikelets 4-8(-12 according to Boott), linear-cylindric, terminal one male or rarely gynaecandrous, peduncled, 1.5-4.5 cm by c. 1 mm (sometimes a smaller second male spikelet added), remaining ones female, lax-flowered, erect or lower cernuous, upper approximate, lower remote, 2-9 cm by 3-7 mm; peduncles very slender, smooth or sparsely scaberulous above, lower long-exserted. Lower bracts foliaceous, slightly shorter than to much exceeding the inflorescence, long-sheathing, upper much reduced; sheaths pale to reddish brown. Glumes oblong-ovate, acute to very obtuse, 3.5-4(-6) mm long, translucent, with broad, white margins and greenish midrib, the latter not reaching the apex but sometimes excurrent below the apex in a short, up to 1(-2) mm long awn. Utricles fusiform, trigonous, membranous, with 2 marginal nerves, otherwise nerveless or obscurely few-nerved, glabrous, smooth, obliquely erect, shining, light green, 5-7.5 by 1-2 mm, rather gradually narrowed into a linear-cylindric, long, smooth beak with oblique, scarious mouth. Nut ellipsoid or oblong-ellipsoid, triquetrous, finally dark brown, shortly stipitate, abruptly beaked, 2.25-3 by 1-1.5 mm. Style thickened at the base. Stigmas 3, long, slender.
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Rhizome short, ligneous. Culms tufted, 25-80 cm tall, slightly thick, obtusely trigonous, smooth, bearing rather many leaves at base. Leaves shorter than or equaling culm, blades 4-8 mm wide, flat, scabrous on veins of upper surface and margins of top; lower sheaths up to 6 cm, reddish brown. Involucral bracts leaflike, longer than or slightly shorter than inflorescence, sheathed, sheathing mouth concave. Spikes 4-7, lowermost spaced up to 10 cm, uppermost 2 ± contiguous; terminal spike male, linear, 1-5.5 cm; remaining spikes female, linear-cylindric, 2-12 cm, loosely many flowered; peduncles slender, slightly pendulous. Female glumes brownish yellow, ovate, ca. 3.5 mm, membranous, 1-veined, margins white hyaline, upper margin praemorse, apex acute, mucronate or muticous. Utricles brownish green, suberect, longer than glume, elliptic-lanceolate, trigonous, 5-7 mm, membranous, glabrous, shiny, 2 lateral veins elevated, base attenuate, shortly stipitate, apex gradually narrowed to a long beak, beak ca. 2.5 mm. Nutlets tightly enveloped, narrowly elliptic, trigonous, ca. 2.5 mm; stigmas 3. Fl. and fr. Jun-Jul.
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