Climber. Leaves opposite; Inflorescence a large, many-flowered, terminal panicle; Sepals with a row of colleters inside. Stamens inserted at corolla mouth, completely exserted from tube, adnate at the attachment of the filament to the anthers and by the thecae to the style head; Fruit of paired narrow follicles; Seeds narrow elliptic;
Asia-Tropical, Eastern and Southeastern Asia present
3 species in Eastern and Southeastern Asia; in Malesia 1 species.