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Erect emersed aquatic; lvs lanceolate or ovate, 12–35 × 1–10 cm, without basal lobes; scape 5–20 dm, with 4–10 whorls of fls, sometimes branching at the lowestwhorl, the upper fls staminate on filiform pedicels 2–3 cm, the lower pistillate on stouter, ascending pedicels 1–1.5 cm; bracts oblong-ovate, obtuse or acute, somewhat boat-shaped, 0.5–1.5 cm, evidently, copiously, and irregularly papillate-roughened or somewhat corrugate-ridged on the back; sep reflexed, oblong-ovate, 3–6 mm, roughened like the bracts; pet 8–15 mm; stamens 12–30, the filaments slender, linear, longer than the anthers, roughened with minute scales; achenes 1.5–2.3 mm; narrowly obovate to often falcate, with marginal wings only, or with 1 or 2 poorly developed facial wings, sometimes with a resin-duct on each face; beak broad-based, obliquely ascending, 0.3–0.7 mm; 2n=22. In shallow water and swamps; near the coast from Del. to Fla., Tex., Mex., W.I., and n. S. Amer. Our plants, as here described, are var. media Micheli. (S. falcata) Typical S. lancifolia is mainly tropical and subtropical.
Plants emersed or partially submerged, 4-20 dm. tall. Leaves erect or ascend-ing, lanceolate to elliptic, attenuate at base and apex, 1-4 dm. long, usually shorter than the elongate petioles. Inflorescences usually longer than the leaves, simple or branched, bearing few to numerous whorls of flowers; pedicels ascending, 1.5-3.0 cm. long; sepals ovate, 0.6-1.0 cm. long, reflexed in fruit; petals 0.8-1.3 cm. long, white.
