Rhizome oblique, woody, rigid. Culms 50-60 cm tall, trigonous, stiff, scabrous above, clothed at base with dark brown sheaths disintegrating into fibers. Leaves surpassing culm, blades broadly linear, 0.8-1.1 cm wide, leathery, flat, revolute, upper margins scabrous, apex acuminate. Involucral bracts leaflike, shorter than inflorescence, sheathing. Spikes numerous; terminal spike male or androgynous (male part equaling female part or 1/3-1/2 length of spike), cylindric, 3-11 × 7-11 mm, densely flowered, shortly pedunculate. Female glumes red-brown, ovate, much narrowed, margins white hyaline, green 3-veined costa excurrent into a mucro. Utricles longer than glume, obliquely patent, ovate-lanceolate, 6-6.5 mm (including beak), leathery, glabrous, faintly many veined, base cuneate, apex abruptly contracted into a cylindric long beak ca. 4 mm, beak scabrous on margins, orifice deeply 2-lobed with divergent teeth. Nutlets yellow-brown, tightly enveloped, elliptic, 3-3.5 mm (including beak), trigonous with angles constricted at middle, faces concave both at apex and base, base with short curved stipe, apex abruptly contracted into a beak 1-1.5 mm; style base hardly thickened; stigmas 3. Fr. Feb.
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