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 Zambia: 6 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| albiflora Ensermu | N,W | |
| glandulosa Lindau | B,N,W,C | Description, Image |
| intrusa (Forssk.) Blume | B,N,W,C,E,S | Description, Image |
| mysorensis (Roth) T. Anderson | W,C | Description, Image |
| welwitschii S. Moore | W | |
| zambiana Brummitt & Chisumpa | N,W |