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 Burundi: 5 taxa. Insects associated with this genus:
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| Species | Content | |
| gangetica (L.) T.Anderson | ||
| guttata (Forssk.) Brummitt | ||
| hedbergii Ensermu | ||
| intrusa (Forssk.) Blume | Description, Image | |
| mysorensis (Roth) T. Anderson | Description, Image |