Boston J. Nat. Hist. 5: 112. 1845.
Plants ± colonial; rhizomes short-creeping between patches. Culms 25–95 cm; vegetative culms numerous, conspicuous, with 15–35 leaves, 3-ranked. Leaves: sheaths with adaxial hyaline band, summits U-shaped, prolonged 0.4–1.6 mm beyond collar; distal ligules 2–3.5 mm; blades 4–7 per fertile culm, pleated, ± auriculate at collar, 9–20 cm × 1–2.7 mm. Inflorescences open or dense, light green to light-brown, 1.3–4 cm × 8–12 mm; proximal internode 2–9 mm; 2d internode 2–5 mm; proximal bracts scalelike or with bristle tips to 3.7 cm. Spikes 2–4 (–6), distant, distinct, clavate-ovoid, 6–18 × 6–12 mm, base attenuate on terminal spike, truncate on lateral spikes, apex rounded. Pistillate scales silvery white to pale-brown, narrow green to brown midstripe, narrowly ovate, 2.3–3.8 mm, as long as and narrower than perigynia, apex obtuse to acute. Perigynia widely spreading, green to pale-brown, conspicuously 5–10-veined abaxially, conspicuously 3–7-veined adaxially, elliptic to nearly orbiculate, planoconvex to biconvex, (4–) 4.5–6.6 × 2.2–3.5 mm, 0.6 mm thick, sometimes finely papillose, margin flat, including wing 0.8–1.3 mm wide; beak white or pale-brown at tip, flat, ciliate-serrulate, abaxial suture usually inconspicuous, distance from beak tip to achene 2–3 mm. Achenes narrowly oblong-lanceolate, 1.8–2.6 × 0.9–1.2 mm, 0.6 mm thick. 2n = 74.
Phenology: Fruiting spring.
Habitat: Bottomland woods on clayey and silty soils, riverbanks
Elevation: 10–100 m
Ark., La., Miss., Okla., Tenn., Tex.
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