Rhizome short, indurate. Culms tufted, 25-50 cm tall, slightly scabrous, clothed with pale brown bladeless sheaths at base. Leaves shorter than culm, blades linear, ca. 2 mm wide, flat, margins scabrous, apex long acuminate; membranous side of leaf sheath transversely wrinkled. Involucral bracts glumelike, ovate or oblong, awned at apex. Spicate inflorescence cylindric, 3-4.5 × 1-1.3 cm, densely flowered above, sparsely below. Female glumes brownish ferruginous, ovate or ovate-oblong, ca. 3 mm, green 3-veined at middle, margins pale hyaline, apex acuminate. Utricles light green-yellow, longer than glume, narrowly ovate or lanceolate-ovate, plano-convex, 3-3.5 × ca. 1 mm, membranous, not ferruginous puncticulate, many veined on both faces, base subrounded, margins not winged, thickened, apex gradually narrowed into a long beak, sharp margins usually subsmooth, sometimes slightly scabrous, orifice 2-toothed. Nutlets brown, loosely enveloped, elliptic, plano-convex, 1-1.2 mm, lustrous, base shortly stipitate; style brown, slender, base not thickened; stigmas 2. Fl. and fr. Jun-Jul.
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