Rhizome slender stoloniferous. Culms 25-35 cm tall, slender, sometimes slightly pendent at apex, obtusely trigonous, smooth, brownish and bladeless sheathed at base. Leaves shorter than culm, blades 1-2 mm wide, flat, sometimes longitudinally grooved, slightly soft, scabrid on margins, sheathed. Involucral bracts leaflike, with long sheath and short blade. Spikes usually 3, rather remote; terminal spike male, linear-lanceolate; lateral spikes female, oblong, 1-2 cm, subdensely few flowered, peduncles slender, pendent. Female glumes yellowish brown, ovate or oblong-ovate, ca. 3 mm, membranous, green 1-veined, apex obtuse, mucronate. Utricles greenish, suberect, slightly longer than glume, oblong-elliptic, indistinctly trigonous, ca. 3.5 mm, leathery, glabrous, densely papillose, few veined, base gradually narrowed and cuneate, shortly stipitate, apex abruptly contracted into a short beak, beak ferruginous-brown, truncate at orifice. Nutlets rather tightly enveloped in utricle, obovate, trigonous; style exserted from utricle, base not thickened; stigmas 3. Fl. and fr. Jun-Aug.
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Plants colonial, long-rhizomatous. Culms 15–40 cm, smooth distally. Leaves: proximal sheaths greenish to pale brownish, ± spongy and septate-nodulose; ligules 1.4–3.5 mm, longer than wide; blades green, ± flat, 2–25 cm × 1–2.5(–3.5) mm, those of fertile and vegetative shoots similar. Inflorescences 4–12(–20) cm, 1.25–2.75 times longer than proximal bract; proximal bracts 1.8–7(–13) cm, sheaths 0.9–2.2(–3.5) cm, blades 0.9–5(–9.5) cm; pistillate spikes 1–2, short cylindric, 0.6–1.5 cm × 4–6 mm; lateral spikes nodding on flexible peduncles. Pistillate scales reddish brown tinged, ovate, broadly acute or obtuse. Perigynia (3–)5–18, dense, glaucous-green, finely many-veined, 2.8–4 × 1.2–1.5 mm, apex gradually tapered to entire orifice, papillose; beak absent or poorly defined, to 0.3 mm. Achenes light to dark brown, 1.5 –1.9 × 1–1.2 mm.
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