Rhizome stoloniferous. Culms 65-70 cm tall, trigonous, smooth, clothed at base with dark brown sheaths. Leaves subequaling culm, blades broadly linear, 7-10 mm wide, herbaceous, slightly stiff, flat, apex acuminate. Involucral bracts leaflike, shorter than inflorescence, long sheathing, 3-3.5 mm. Inflorescence subpaniculate, spikes numerous; terminal spike male, 1-1.5 cm; remaining spikes androgynous, male part longer than female part, cylindric, 1.5-4.5 cm, loosely flowered, with slender unequal peduncles. Female glumes yellow-brown, oblong-lanceolate, 5.8-6.5 mm, margins white hyaline, apex acuminate. Utricles longer than glume, obliquely patent, ovate-lanceolate, 7-7.5 mm (including beak), glabrous, nerveless except for 2 costas on edges, base shortly stipitate, stipe ca. 1 mm, apex abruptly contracted into a long beak ca. 3.5 mm, orifice obliquely truncate, 2-toothed. Nutlets oblong, ca. 2 mm, base shortly stipitate; style ca. 2.5 mm, base curved, glabrous; stigmas 3. Fl. and fr. Jun-Jul.
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