Climbers, mostly large woody lianas. Leaves opposite; venation often raised, veins anastomosing before margin forming an intramarginal nerve; usually with the base of the petioles meeting across the stem; few glands in the axils or absent. Inflorescence a cyme; axillary and/or terminal, often forming a terminal panicle; flowers 5-merous. Sepals of free lobes, without colleters inside. Corolla lobes sinistrorse; open corolla infundibuliform or salverform; with a corona at the mouth of the corolla. Stamens free from style head, completely included in tube; anthers narrowly elliptic or narrowly ovate, base very short bluntly sagittate, fertile entire length; filaments short, filiform. Disk absent. Ovary syncarpous, bilocular, with numerous ovules, glabrous; style slender. Fruit a hard-walled solitary berry. Seeds ellipsoid, flattened; surface patterned.
Plants woody lianas or sometimes low shrubs, latex present. Leaves opposite. Cymes terminal or axillary. Flowers white. Calyx without glands. Corolla salverform; tube cylindric, dilated at staminal insertion; lobes usually oblique-falcate, overlapping to left; corona scales 5 or 10, erect. Stamens inserted at or below middle of corolla tube, included; filaments very short; anthers free from pistil head, base rounded; disc absent. Ovary 2-loculed; ovules numerous. Style short; pistil head apex dilated, 2-cleft. Berry large, pulpy. Seeds numerous; coma absent.