| Leaves emersed, basal, long-petiolate, elliptic, linear or ovate. |
Scapes usually erect; flowers in whorls of 3 at 5-12 nodes, frequently branches at the lowest whorl, lower pistillate or perfect, upper usually staminate.
Sepals 3, reflexed in staminate flowers, stamens 7 or more, filaments pubescent, carpels numerous, separate.
Fruiting heads globose, 1-1.8 cm in diameter, achenes 1.5-2.3 mm long, flat, obovoid, winged, beaked.
Sallow water of swamps and ponds, Florida prairies, marshes
Coastal plain, Florida to Texas