Plants perennial, twining, decumbent or erect. Flowers solitary, terminal or axillary. Calyx lobes 5, foliaceous. Corolla campanulate with 5 short lobes; bluish-green. Stamens 5, free, filaments flattened, situated on the margin of the disc. Capsule fleshy when young, becoming dry and hard, beaked, dehiscing localicidally by 3 valves. Ovary 3-locular; styles cylindrical; stigmas 3, flattened.