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 DRC: 5 taxa. Insects associated with this genus:
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| Species | Botanical divisions | Content |
| multicaulis (Hochst. ex A.Rich.) | ||
| nagchana (Nees) Bennet | Description, Image | |
| radicans Nees | ||
| trichocalyx (Oliv.) Lindau subsp. trichocalyx | ||
| trichocalyx (Oliv.) Lindau subsp. verticillaris (C.B. Clarke) Vollesen | Description, Image |