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. Angola: 5 taxa. Insects associated with this genus:
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| Species | Provinces | Content |
| divaricata Hutch. | Image | |
| heudelotii Planch. | BO,CC,LS,MA,MO,ZA | Description, Image |
| lotus L. | BO,CN,LN,MA,NA,ZA | Description, Image |
| nouchali Burm. f. var. caerulea (Savigny) Verdc. | BO,CC,CN,HA,HI,LS,MA,MO,NA | Description, Image |
| sulphurea Gilg | CC,LS,MO | Description, Image |