Herbs, perennial, cespitose, bases cormose; rhizomes knotted, beaded. Culms trigonous, 15–48 cm × 0.4–1 mm, glabrous. Leaves flat, 10–30 cm × 0.5–2 mm. Inflorescences: spikes rather densely ovoid, 1–3.5 cm; rays 0 (sometimes 1–4), 1–6 cm; rachis 1–4 mm; bracts 3–4, horizontal to slightly reflexed, flat, 6–25 cm; rachilla ± deciduous, wingless. Spikelets 25–60, compressed, oblong-lanceoloid, 5–12 × 2.2–3.5 mm; floral scales deciduous, 5–15, yellowish to yellowish brown, laterally 4–5-ribbed, oblong-ovate, 2.6–3.6 × 1.4–2 mm, margins loosely spreading or clasping achene. Flowers: anthers 0.8–1 mm; styles 1 mm; stigmas 1.5–2.5 mm. Achenes dark grayish brown, sessile, narrowly oblong, 1.8–2.2 × 0.5–0.8 mm, apex obtuse, apiculate, surfaces puncticulate.
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Much like no. 27 [Cyperus lupulinus (Spreng.) Marcks]; lvs gray-green, 1–2.5 mm wide; heads stramineous to yellowish-brown; spikelets 2–3 mm wide; anthers 0.6–1 mm; achene a little narrower, a third to nearly half as wide as long; 2n=ca 166. Dunes, pine-barrens, and disturbed sandy places, mainly on the coastal plain; se. Md. and se. Va. to Fla. and Tex. (C. martindalei)
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