Plants not cespitose. Culms acutely angled, 50–100 cm, scabrous. Leaves: basal sheaths red-brown; sheaths of proximal leaves scabrous, fronts with red-brown spots, prominently ladder-fibrillose, apex U-shaped; blades 4–8 mm wide. Inflorescences: proximal bract shorter than inflorescence, 3–5 mm wide. Spikes erect; staminate 2–3; pistillate 2–4; proximal pistillate spike 3–7 cm × 3–5 mm, base cuneate. Pistillate scales dark red-brown to black, shorter than perigynia, apex obtuse, awnless. Perigynia ascending, pale brown with red-brown spots on apical 1/2, 3–7-veined on each face, somewhat flattened, loosely enclosing achenes, thick-walled, ellipsoid or ovoid, 3–3.5 × 2–2.2 mm, somewhat leathery, dull, often scabrous on apical margins, apex obtuse, papillose; beak pale brown or red-brown, 0.2–0.3 mm. Achenes not constricted, dull.
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