Herbs or shrubs, usually growing in wet places. Stipules reduced or 0. Leaves alternate or opposite, mostly entire. Bracteoles conspicuous or 0, usually 2 at or near the base of the ovary. Hypanthium 0. Sepals 3-7, persistent in fruit. Petals yellow or 0. Fruit a capsule, dehiscing irregularly. Seeds without hairs. Worldwide: 82 species, cosmopolitan, but mostly America Zambia: 12 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| abyssinica A. Rich. | B,N,W,C,S | Description, Image |
| adscendens (L.) H. Hara | Image | |
| adscendens (L.) H. Hara subsp. diffusa (Forssk.) P.H. Raven | B,N,W,C,E,S | Description, Image |
| erecta (L.) H. Hara | N,S | |
| leptocarpa (Nutt.) H. Hara | B,N,C,E,S | Description, Image |
| octovalvis (Jacq.) P.H. Raven subsp. brevisepala (Brenan) P.H. Raven | N,W,C,S | Description, Image |
| octovalvis (Jacq.) P.H. Raven subsp. octovalvis | N,E,S | Description |
| palustris (L.) Elliott | B | Description |
| perennis L. | S | |
| senegalensis (DC.) Troch. | B,N,S | Description, Image |
| stenorraphe (Brenan) H. Hara subsp. macrosepala (Brenan) P.H. Raven | W | |
| stenorraphe (Brenan) H. Hara subsp. stenorraphe | W,S |