Rhizome short. Culms densely tufted, 13-16 cm tall, less than 1 mm thick, filiform, triquetrous. Leaves shorter than or equaling culm, linear, revolute on margins, blades 1-1.5 mm wide, soft, sheaths dark brown, persistent. Involucral bracts leaflike, shorter than inflorescence, long sheathed. Spike single, terminal, androgynous, cylindric, 1-1.5 cm, 2-3 mm thick; male part of spike slightly shorter than female part, few flowered; female part loosely 8-12-flowered. Female glumes pale green laterally, ovate or ovate-oblong, 2.8-3.2 mm, subleathery, green 1-costate, margins brownish and narrowly membranous, apex acute. Utricle greenish, longer than glume, obovate-oblong, 4-4.2 mm, subleathery, 2-veined laterally and thinly several veined, winged at lower part, base stipitate, margins ciliate, apex abruptly contracted into a short beak, orifice shortly 2-toothed. Nutlets brown at maturity, obovate-oblong, trigonous, 2.3-2.5 mm, granular-punctate, base contracted to a short stipe, apex beakless; style base thickened, conic; stigmas 3. Fl. and fr. Jun-Jul.
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