Lianas trees or shrubs. Leaves opposite, imparipinnate-compound, entire or dentate, petiolate; stipules absent. Flowers irregular, bisexual. Calyx tubular. Corolla tubular, 5-lobed. Stamens usually 4, epipetalous. Ovary superior, 2-locular, with axile placentas. Fruit a loculicidal or septicidal capsule, 2-valved. Seeds often winged. C. 120 gen., trop. and subtrop. especially S. America