Glabrous perennial with shortly creeping, obliquely descending rhizome covered with ovate-lanceo-late scales. Stems uniseriate on the rhizome, close together, erect, rather stiff, prominently 4-5-angled or almost winged, smooth, 30-75 cm by 1-3 mm. Leaves of the flowering stems reduced to 2-4 blade-less sheaths, the lower ones ovate or oblong-ovate, fuscous, the upper ones tubular, herbaceous, with obliquely truncate, membranous upper margin, up to 15 cm long; sterile shoots unknown; ligule absent. Inflorescence compound or decompound, loose or rather dense, with many spikelets, 2-4(-7) cm long and wide. Involucral bracts 2-5, very short, lanceo-late, with recurved setaceous point, up to 1½ cm. Primary rays rather rigid, slightly compressed, smooth, or scabrid at the top, up to 5 cm. Spikelets solitary or some subaggregated, ellipsoid, ovoid, or broadly ovoid, angular, obtusish, densely many-flowered, 3-5 by c. 2 mm; rachilla narrowly winged. Glumes spiral, membranous, ovate, obtuse, muticous (midnerve ending somewhat below the apex), keeled, 3-nerved on the castaneous back, with nerveless, yellowish sides and broad hyaline margins in the upper half, 2-2¼ by 1½ mm. Stamens (2-)3; anthers oblong-linear, ¾-1 mm. Style triquetrous, with pyramidally thickened base, glabrous, 1 mm; stigmas 3, about as long as the style. Nut trigonous, broadly obovoid, shortly stipitate, not umbonulate, smooth or sparsely verruculose, reticulate-lineolate by the transversely elliptic or oblong epidermal cells in 9-13 vertical rows on each face, whitish or brown-ish, 4/5-9/10 by 3/5-7/10 mm.
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Perennials, rhizomatous. Culms crowded along rhizome, 30-80 cm tall, 1-3 mm thick, acutely 4-or 5-angled, smooth. Leaves bladeless; sheath dusky or cinnamon brown, 1-17 cm, apex lanceolate; ligule absent. Involucral bracts 2-5, setaceous with lanceolate base, longest to 1.5 cm. Inflorescence a compound or decompound anthela, 2-6 × 2-6 cm, open; primary rays 6-8, to 5 cm. Spikelets ovoid to ovoid-ellipsoid, 3-5 × ca. 2 mm. Glumes many, spirally imbricate, light brown, ovate, 2-2.3 × ca. 1.5 mm, membranous, margin hyaline, 1-veined forming an abaxial pale brown obtuse keel, apex obtuse. Stamens (2 or)3; anthers 0.7-1 mm. Stigmas 3. Nutlet whitish to yellowish brown, broadly obovoid, 0.8-1 × 0.6-0.8 mm, 3-sided, smooth to sparsely verruculose, with 9-14 longitudinal rows of epidermal cells on each side. Fl. and fr. Sep.
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