Linnaea 22:348. 1849.
Herbs, perennial, 5–15 dm. Rhizomes long, thick, scaly. Culms gray-green, 2–5 mm diam. Cataphylls 2–5. Leaves basal, 1–3; auricles absent; blade terete, 40–80 cdm × 1.5–2.5 mm. Inflorescences sympodial or appearing lateral, glomerules to 150, each with 2–6 perfect or pistillate flowers, congested to open, 4–20 × 5–10 cm; primary bracts terete, longer than inflorescence. Flowers: tepals pale brown, 2.5–3.3 mm, apex acuminate; outer series acuminate; inner series slightly shorter, acutish; stamens 6, sometimes rudimentary, filaments 0.2–0.7 mm, anthers 1.3–2.5 mm; style 0.3–1 mm. Capsules brown, 3-locular, ovoid to oblate, 1.7–3 × 1.3–1.6 mm, mostly distinctly shorter than perianth, apiculate. Seeds dark brown, ellipsoid, 0.4–0.6 mm, not tailed.
Phenology: Flowering and fruiting spring–early fall.
Habitat: Coastal tidal marshes in dense zonal stands
Ala., Del., D.C., Fla., Ga., La., Md., Miss., N.C., S.C., Tex.as, Va.