Unarmed herbs, usually viscid. Leaves mostly alternate, the upper sometimes in pairs and appearing opposite. Inflorescence a solitary flower, arising from a pair of leaf-like bracts. Calyx deeply divided, almost to the base, slightly accrescent in fruit. Stamens 5, included. Fruit a capsule. Seeds numerous, minute. Worldwide: 35 species in tropical and warm regions of S America Zimbabwe: 2 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| × hybrida (Hook.) Vilm. | C | |
| integrifolia (Hook.) Schinz & Thell. | W |