Culms 20–90 cm, pilose. Leaves: ligules shorter than wide; blades 1.5–4 mm wide, pilose on both surfaces. Inflorescences: lateral spikes 8–18 × 3–5.5 mm, usually crowded; terminal spike gynecandrous, at least 1/2 of flowers pistillate, 10–20(–25) mm. Pistillate scales ovate, 1.8–2.5 × 0.7–1.3 mm, apex obtuse, sometimes mucronate, shorter than perigynia. Staminate scales ovate to lanceolate, 2.1–5.2 mm, apex acuminate. Anthers 1.3–2.2 mm. Perigynia ascending, weakly 9–18-veined, obovate-circular, ± trigonous in cross section, 2–3 × 1.1–1.6 mm, not papillose, glabrous; beak absent. Achenes 1.6–2.1(–2.6) × 0.8–1.3 mm. 2n = 52.
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