Rhizome thick and short, ligneous. Culms densely tufted, up to 85 cm tall, rather thin, trigonous, smooth, clothed with sheaths eventually disintegrating into fibers. Leaves basal, shorter than culm, blades 5-8 mm wide, smooth on both surfaces, scabrous on upper margins; sheaths brown, usually splitting. Involucral bracts sheathed, lower involucral bracts leaflike, upper involucral bracts sublinear, longer than spike. Spikes 6 or 7, remote at lower part and ± contiguous at upper part, androgynous, male part shorter than female part, narrowly cylindric, (2-)3-5 cm, sparsely many flowered; peduncle clothed in involucral bract sheath. Female glumes stramineous, lanceolate, 3-4 mm, membranous, 1-costate, apex acuminate, sometimes mucronate. Utricles stramineous, longer than glume, suberect, oblong-lanceolate, plano-convex, ca. 5 mm, membranous, glabrous, several veined, base gradually narrowed into a short stipe, apex gradually narrowed into a long beak, beak smooth on margins, rather long 2-toothed at orifice. Nutlets dark brown, tightly enveloped, elliptic, biconvex, ca. 2.5 mm, base shortly stipitate, apex mucronate; style base slightly thickened; stigmas 2. Fl. and fr. Jun-Jul.
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