| Herbs or shrubs. Inflorescence terminal or axillary, thyrses, cymes or solitary. Calyx actinomorphic, 5-lobed. Corolla ± actinomorphic or 2-lipped; campanulate above; rugula on upper lip indistinct; lobes 5. Fertile stamens 4, didynamous; anthers 2-thecous. Ovary with 2 ovules. Seeds without hygroscopic hairs. Worldwide: c. 70 species in the Old World tropics Botswana: 3 taxa.Insects associated with this genus: 
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| Species | FZ divisions | Content | 
| intrusa (Forssk.) Blume | N | Description, Image | 
| mysorensis (Roth) T. Anderson | N | Description, Image | 
| retrocarpa T. Edwards | SE | Description, Image |