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 DRC: 8 taxa. Insects associated with this genus:
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| Species | Botanical divisions | Content |
| abyssinica A. Rich. | Description, Image | |
| adscendens (L.) H. Hara subsp. diffusa (Forssk.) P.H. Raven | Description, Image | |
| erecta (L.) H. Hara | ||
| hyssopifolia (G.Don) Exell | Description | |
| leptocarpa (Nutt.) H. Hara | Description, Image | |
| palustris (L.) Elliott | Description | |
| senegalensis (DC.) Troch. | Description, Image | |
| stenorraphe (Brenan) H. Hara subsp. stenorraphe |