MorphologyRead full entry
DescriptionPlants not cespitose. Culms acutely angled, 10–110 cm, scabrous. Leaves: basal sheaths red-brown; sheaths of proximal leaves glabrous, fronts lacking spots and veins, apex truncate; blades epistomic, 2–4.5 mm wide, adaxially papillose. Inflorescences: proximal bract subequal to inflorescence, 1.5–4 mm wide. Spikes erect; proximal 2–3 spikes pistillate, 1.2–4.2 cm × 3–5 mm, base obtuse or acute; terminal 1–2 spikes staminate. Pistillate scales dark purple-brown or black, shorter than perigynia, apex obtuse, awnless. Perigynia ascending, pale brown with red-brown or black spots on apical 1/2, occasionally black on apical 1/2, 3–9-veined on each face, somewhat flattened, tightly enclosing achenes, stipitate, ellipsoid or obovoid, 2–3.7 × 1.1–2.1 mm, somewhat leathery, dull, base truncate, distended, apex obtuse or rounded, papillose; stipe 0.1–0.3 mm; beak red-brown or black, 0.1–0.2 mm, orifice scabrous. Achenes not constricted, whitish iridescent, base adnate to perigynium. 2n = 83, 84, 85.