Rhizome slender, elongate, covered with pale brown split scales. Culms loosely tufted, 10-25 cm tall, slender, soft, slightly scabrid on angles, leafy in lower 1/4. Cauline leaves shorter than culm; blades hairlike, ca. 0.3 mm wide, flat, smooth, soft; basal sheath pale brown. Inflorescence 1-spiked, terminal, ovate, 6-8 mm; male part very short, 1-3-flowered; female part 4-6-flowered, longer than male part. Female glumes red-brown to dark brown laterally, green at middle, elliptic-ovate, ca. 2.5 mm, 1-veined, apex acute. Utricles erect at maturity, oblong-lanceolate, trigonous, ca. 3.5 mm, membranous with rather distinct slender veins on both sides, base rounded, apex gradually attenuate into a beak, orifice minutely 2-toothed. Nutlet loosely enveloped, elliptic, trigonous, ca. 2 mm; style base not thickened, persistent; stigmas 3. Fl. and fr. May-Jul.
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