Twining shrubs with watery sap (milky in the fruit). Leaves ovate, firm but not fleshy. Flowers in pedunculate umbelloid cymes, solitary at nodes. Calyx lobes ovate or ovate-lanceolate, acute, glabrous. Corolla green, rotate, lobes twisted to right in bud, margin ciliate. Corona single, of 5 fleshy truncate lobes with an apical tooth projecting horizontally inwards, attached to the upper part of staminal column. Anthers with the connective produced into a membranous appendage. Pollinium solitary in each loculus, ascending without a pellucid margin. Follicle ovoid-oblong, longitudinally grooved, apex subtruncate.