in J. Lamarck et al., Encycl. 3: 264. 1789.
Herbs, perennial, 5–10 dm. Rhizomes thick. Culms closely set along rhizomes, 2–3.5 mm diam. Cataphylls 3–5. Leaves basal, 2–4; auricles absent; blade terete, 40–60 cm × 1–2 mm. Inflorescences glomerules, to 100, each with 2–4 flowers, congested to open, 5–19 × 2–5 cm; primary bracts somewhat inflated, usually surpassing inflorescence. Flowers: tepals straw-colored; outer series 2.8–2.9 mm, apex acute; inner series elliptic, 2.3–2.5 mm, apex obtuse; stamens 6, 1.4–1.9 mm, anthers 2 times length of filaments; style 1–1.2 mm. Capsules straw-colored, 3-locular, ovoid to ellipsoid, 2.5–3.5 × 1.2– × 1.5 mm, nearly equal to slightly exceeding perianth. Seeds brown, ellipsoid, body 0.6–0.7 mm, tails 0.5–1.2 mm. 2n = 40, 48.
Phenology: Flowering and fruiting summer.
Habitat: Coastal salt marshes, saline meadows, and sand dunes
Introduced; N.Y., Europe, Asia, Africa.
It is believed that this species has not been collected in North America since the late 1800s, when it was known to occur on Long Island, New York.