Rhizome short. Culms tufted, 25-50 cm tall, slender, trigonous, slightly scabrid. Basal sheaths bladeless or with short blades, usually split into fibers. Leaves longer or shorter than culm, blades 1.5-2(-3) mm wide, flat. Basal involucral bract leafy, rarely shortly leaflike, longer than subtending spike, sheathed, sheath 1-2.2(-3) cm. Spikes (3 or)4 or 5; terminal spike male, linear-cylindric, 15-60 × 2-3 mm, with exserted peduncle 0.8-5 cm; lateral spikes female, cylindric, 1-3.5 cm, 2-3 mm thick, rather densely or loosely flowered, lower ones pedunculate, upper ones subsessile. Female glumes pale, obovate or oblong, 2-2.5 mm (excluding awn), green costa 3-veined, excurrent into an awn 1-2.5 mm. Utricles green, longer than glume, rhombic-elliptic, 3-3.5 mm, membranous, sparsely puberulent, many veined, irregularly excavated, base attenuate, shortly stipitate, apex contracted into a short conic beak, orifice 2-toothed. Nutlet tightly enveloped, ovate, trigonous, ca. 2 mm, with angles contracted at middle, with faces excavated both in upper and lower parts, base shortly stipitate, apex discoid-annulate; style short, base conically thickened; stigmas 3. Fl. and fr. Apr-May.
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