Culms obtusely trigonous in cross section, (25–)35–125 cm, smooth. Leaves: ligules 1.5–13(–18) mm, narrower to wider than long; blades yellowish or light green, M-shaped to flat, widest leaves of vegetative shoots (3.5–)4–12 mm wide, smooth or sometimes papillose adaxially, especially distally. Inflorescences (3–)15–50 cm; bract sheaths prolonged, apex truncate to convex; proximal (1–)2–4 spikes usually androgynous or, occasionally, pistillate, erect or the proximal spreading, ovoid to short cylindric. Pistillate scales ovate to narrowly ovate, mostly 1/2–2/3 as long as perigynia, apex acute to acuminate-awned. Anthers 3–5 mm. Perigynia spreading to somewhat reflexed, pale green, 20–26-veined, essentially uninflated, lanceolate, (8.3–) 10.5–13.5(–15) × 1.5–2.4 mm, 4–7 times as long as wide, apex tapered to bidentulate; beak absent. Achenes 2.3–3.4(–3.8) × 1.8–2.4 mm, 1.3–1.8 times as long as wide.
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