Rhizome stout and short, ligneous, without stolons, with rather many rootlets. Culms laxly tufted, 35-70 cm tall, triquetrous, rather stout, scabrous on upper angles, clothed with red-brown and bladeless sheaths. Upper leaves longer than culm, lower leaves shorter than culm, blades 6-12 mm wide, sometimes up to 15 mm wide, flat, sometimes involute on margins, slightly soft, with distinctly transverse septate nodes between veins on abaxial surface; sheaths ferruginous, ligulate, up to 6 cm. Involucral bracts leaflike, longer than inflorescence, lower involucral bracts slightly long sheathed, upper involucral bracts shortly sheathed or not sheathed. Spikes 6-8, remote in lower part, approximate in upper part; terminal spike male, linear-cylindric, 1-2 cm, shortly pedunculate or subsessile; lateral spikes female, cylindric or oblong-cylindric, 2.5-4 cm, 5-6 mm thick, densely many flowered, pedunculate, upper peduncles rather short. Female glumes brownish yellow, shortly ferruginous striate, ovate or broadly ovate, ca. 3 mm, membranous, glabrous, green 1-costate, apex acute, usually mucronate. Utricles green-brown, shortly ferruginous striate, suberect, longer than glume, obovate, obtusely trigonous, 4-5 mm, densely white hispidulous, 2-veined laterally, base cuneate, apex abruptly narrowed to a slightly short beak, orifice shortly 2-toothed. Nutlets brown, tightly enveloped, elliptic, trigonous, 2.5-3 mm, smooth; style short, base slightly thickened; stigmas 3. Fl. and fr. May-Jul.
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