Suffrutices or small shrubs. Inflorescence of axillary cymes or solitary. Calyx actinomorphic, 5-lobed. Corolla distinctly 2-lipped; upper lip 2-lobed; lower lip 3-lobed. Fertile stamens 4, didynamous. Capsule cylindric. Seeds bearing hygroscopic hairs; seeds 2 per loculus. Worldwide: 65 species in tropical and warm regions Zimbabwe: 7 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| alba S. Moore | N,C,E | |
| albiflora Lindau | N | |
| capricornis C.B. Clarke | E | |
| hildebrandtii (S. Moore) S. Moore | N,W,C,E,S | Description, Image |
| nagchana (Nees) Bennet | W,C,E | Description, Image |
| pilifera Hutch. | N | |
| trichocalyx (Oliv.) Lindau subsp. verticillaris (C.B. Clarke) Vollesen | N,C,E | Description, Image |