Culms 35–150 cm, angles scabrous. Leaves: basal sheaths leafless, usually red-brown; blades epistomic, 5–18 mm wide, adaxially papillose. Inflorescences: peduncle of proximal spike to 11 cm; proximal bract longer than inflorescence, 3–10 mm wide. Spikes pendent or the terminal usually erect; proximal 3–6 spikes pistillate, 4.5–11.5 cm × 4–7 mm, base attenuate; terminal 2–4 spikes staminate. Pistillate scales red-brown or purple-brown. Perigynia pale brown, ellipsoid, 1.9–3.5 × 1–1.2 mm, apex acute or obtuse; beak purple-brown, 0.3–0.4 mm, papery. 2n = 72, 74, 78, 80.
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