Annual or perennial, aquatic or marsh herbs. Stems erect or creeping and rooting at the nodes. Submerged leaves laciniate, pinnatifid; aerial leaves opposite to whorled, entire, laciniate or pinnately-divided. Flowers solitary, axillary or in terminal spikes or racemes. Corolla 5-lobed, 2-lipped. Stamens 4, included, didynamous. Style filiform. Capsule ellipsoid to spherical. Worldwide: c. 35 species in the Old World tropics and subtropics. Zambia: 7 taxa. |
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| Species | FZ divisions | Content |
| bangweolensis (R.E. Fr.) Verdc. | N,C | |
| barteri Skan | B | |
| ceratophylloides (Hiern) Skan | W,S | Image |
| crassifolia Philcox [DD] | W | |
| dasyantha (Engl. & Gilg) Skan | N | |
| fluviatilis A.Chev. | N | |
| indica (L.) Druce | B,C,S | Description, Image |