Aquatic herbs. Leaf lamina elliptic to subcircular, deeply cordate, peltate. Sepals 4, green. Petals 5-many, inner ones shorter and narrower, grading into the stamens. Stamens with petaloid filaments. Carpels numerous, many-ovulate. Fruit a large fleshy berry, ripening under water. Seeds floating owing to a pulpy sack-like aril. Worldwide: c. 50 species, cosmopolitan. Zambia: 7 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| divaricata Hutch. | N | Image |
| heudelotii Planch. | Description, Image | |
| lotus L. | S | Description, Image |
| maculata Schumach. & Thonn. | ||
| nouchali Burm. f. var. caerulea (Savigny) Verdc. | B,N,W,C,S | Description, Image |
| nouchali Burm. f. var. petersiana (Klotzsch) Verdc. | ? | Description, Image |
| sulphurea Gilg | N,W | Description, Image |