Plants terrestrial, annual or perennial herbs, rarely shrubs. Leaves entire or digitate. Flowers solitary. Pedicel short. Calyx deciduous or persistent. Corolla white, pink, to purple, obliquely campanulate, obscurely bilabiate; lowest lobe longest. Disc glandular. Ovary 2-locular, divided by a false septum almost to apex. Ovules numerous, uniseriate in each locule. Fruit a longitudinally dehiscing capsule, oblong to obconical, 4-sulcate, beaked. Seeds obovate, compressed, winged, fringed, or rarely smooth; testa smooth or rugose.

Twenty-one species: primarily in Africa, India, and Sri Lanka; one species in China.