Rhizomes short. Basal sheaths prominent and persistent, pale brown or brown, dull, fibrillose, not retaining dried leaf blades. Culms densely tufted, erect and rigid, occasionally filiform, obtusely trigonous, (2-)10-44 cm tall, 0.7-1.5 mm in diam. Leaves basal, ± equaling culms; blade filiform, margin involute, 0.3-1.1 mm wide. Inflorescence spicate, androgynous, linear, 1.5-8 × 0.2-0.5 cm, dense above, looser below; lowest involucral bract glumelike, apex long aristate. Spikelets all unisexual, 1-flowered. Male glumes yellowish brown laterally, with green midvein, narrowly oblong, ca. 7.5 × 1.5 mm, sides papery, margin not hyaline, apex obtuse. Female glumes brown laterally, with green midvein, ovate to lanceolate, 3.3-5 × 2-2.4 mm, midvein broad, margin hyaline or not, apex mucronate, acute, or obtuse. Prophylls lower part pale green, apex brown, utriculiform, linear-oblong, 4-7.5 × 0.8-1.7 mm, membranous, 2-keeled, keels scabrid, margins open only near apex. Nutlets narrowly oblong or oblanceolate, trigonous, stipitate and beaked, 3.5-6.5 (including beak and stipe) × 0.7-1 mm, beak 1.5-2.2 mm, stipe ca. 0.5 mm. Stigmas 3. Sterile rachilla of female spikelets green, linear, 1/4-2/3 as long as nutlet, margin ciliate. Fl. and fr. Jun-Oct.
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