Alternanthera Forssk.

Perianth segments free; inflorescence not woolly Alternanthera
Plants glabrous except the young tips of the branches and the nodes. Leaves linear-lanceolate or narrow-oblong to oblanceolate and obovate, from less than 1 to 6 cm long, up to 6 mm wide.
Plants ± pubescent. Leaves usually more than 6 mm wide