Glabrous perennial with creeping, woody rhizome clothed with lanceolate scales. Stems slender, soli-tary, compressed-triquetrous, striate-sulcate, scabrid at the top, few-leaved at the base, 20-60 cm by ½-¾ mm. Leaves shorter than the stems, rigid, flat or with inrolled, scabrid margins, acute, rather abruptly acuminate, often with a subulate point, dark green, 1-2 mm wide; ligule absent; lower sheaths bladeless, hardly keeled. Inflorescence simple or subcompound, loose, with 3-10 spikelets, 1½-4 cm long. Involucral bracts very short, lanceolate or with a setaceous point, up to 1½ cm long. Rays suberect, compressed, smooth, 1-2 cm long. Spikelets solitary, ovoid-lanceolate, angular, acute, rather loosely flowered, castaneous, 7-15 by 3-4 mm; rachilla broadly winged. Glumes spiral, subcharta-ceous, ovate, rather acute to obtuse, muticous, keeled, with 3-nerved, green keel and hyaline margins, gland-dotted in the upper half, 4½-6 by c. 3½ mm. Stamens 3; anthers linear, 2-2½ mm long. Style triquetrous, pyramidally thickened at the base, glabrous, 2½-4 mm; stigmas 3, usually shorter than the style. Nut trigonous, broadly obovoid, shortly stipitate, umbonulate, verruculose, whitish, 1-1.2 by 1 mm; epidermal cells transversely elliptic-oblong.
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Perennials. Rhizomes to 2 mm in diam., creeping, covered with ovate scales. Culms solitary, 13-35 cm tall, flatly 3-angled, apical part scabrid, with 4-6 leaves and 2 nearly leafless sheaths at base. Leaves shorter than to nearly as long as culm; sheath rust-colored, adaxially membranous, not ciliate, mouth obliquely split; ligule absent; leaf blade 1.2-2 mm wide, margin flat to incurved and finely serrulate, apex acute. Involucral bracts 1-3, subulate or glumelike, shorter than inflorescence, apex with a long awns. Inflorescence a simple anthela, 1.5-2.5 cm, with 2-7 spikelets. Spikelets oblong, ellipsoid, or ovoid, 6-10 × 2.5-4 mm, 9-flowered, apex acute. Glumes chestnut-brown, broadly ovate, ca. 4 mm, 3-veined forming an abaxial green keel, margin membranous and white, apex obtuse to subacute; basal 2 glumes with an apical short hard mucro. Stamens 3; anthers linear-oblong, ca. 2 mm, ca. 1/4 as long as filaments. Ovary oblong, 3-sided, basally slightly narrower; style 3-sided, not ciliate, basally conic; stigmas 3, nearly as long as style. Nutlet brown, broadly obovoid, ca. 1 mm or more, flat to convex, finely verruculose. Fl. and fr. May-Sep.
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