Plants not cespitose. Culms acutely angled, 30–110 cm, scabrous. Leaves: basal sheaths red-brown; sheaths of proximal leaves bladeless, scabrous, fronts with red-brown spots, prominently ladder-fibrillose, apex red-brown, U-shaped; blades hypostomic, 4–7 mm wide, papillose abaxially. Inflorescences: proximal bract subequal to inflorescence, 3–6 mm wide. Spikes erect; staminate 1–2; pistillate 3–4; proximal pistillate spike 2.5–7 cm × 3–5 mm, base attenuate. Pistillate scales red-brown or black, longer than perigynia, apex acute, awnless. Perigynia ascending, pale brown with red-brown spots on apical 1/2, 1–3-veined abaxially, somewhat flattened, loosely enclosing achenes, ellipsoid or obovoid, 2.2–3 × 1.2–2 mm, dull, apex obtuse or acute, papillose; beak red-brown, 0.2–0.5 mm. Achenes not constricted, dull. 2n = 66, 68.
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