Plants loosely cespitose; rhizomes stout. Culms 20–50 cm, smooth, glabrous. Leaf blades V-shaped in cross section when young, 1.5–2.8 mm wide, usually involute, proximally puberulent. Inflorescences: proximal bracts sheathless or sheath not more than 2(–5) mm; lateral spikes 10–20 × 5–9 mm, all in distal 1/2 of stem; terminal spike 10–32 × 1.5–3 mm. Pistillate scales 3–5-veined, ovate, 2.8–5 × 1.6–2.2 mm, proximal ones shorter than perigynia, apex acute. Staminate scales 3-veined, 4.5–5.5 × 1.6–2.2 mm. Perigynia 20–30-veined, subsessile, ovoid to obovoid, 4–6 × 1.9–2.4 mm, pilose, hairs not more than 0.2 mm; beak distinct or obscure, to 0.5 mm. Achenes sessile, 3–3.5 × 1.9–2 mm, almost filling bodies of perigynia.
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