Ann. Lyceum Nat. Hist. New York 1: 67. 1824.
Culms 4–37 cm; cataphylls with concave cells. Leaves: basal sheaths golden brown to dark-brown; blades green, eceeding culms, 0.8–4.8 mm wide, herbaceous, margins green, scabrous. Lateral spikes 1–5, basal, on spreading to nodding peduncles. Terminal spikes with staminate portion 3–13flowered, (4.2–) 5.814.5 × 0.40.8 mm; pistillate portion 14-flowered. Pistillate scales green, margins connate, hyaline, white, occasionally tinged reddish-brown; proximal scales with margins 1.4–3 mm, apex long-acuminate; distal scales with margins 0.4–0.8 mm wide, apex acuminate, awnless. Staminate scales ovate, 1.1–1.8 (–2.1) × 1.2–1.5 mm, 0.12–0.25 (–0.75) length of staminate portion of terminal spike, margins hyaline, white, often with reddish-brown subapical band, apex truncate or broadly obtuse. Anthers 0.6–1.6 mm. Perigynia green to bronze, globose to ellipsoid, 4.4–7.2 × 1.9–2.4 mm, tightly enveloping achenes, apex abruptly tapering; beak 1.6–3.8 mm, scabrous. Stigmas filiform, flexuous, strongly papillose. Achenes dark-brown, globose to ellipsoid, 2–2.6 × 1.7–2.4 mm. 2n = 66, 70.
Phenology: Fruiting spring–summer (early May–mid Jul).
Habitat: Mesic, rich ravines, slopes, and flood plains in hardwood forests, on lime-rich substrates
Elevation: 100–400 m
Ont., Ala., Ark., Ill., Ind., Iowa, Kans., Ky., Md., Mich., Minn., Miss., Mo., Nebr., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va., Wis.
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