Large woody or herbaceous twiners. Leaves petiolate, ovate, mostly cordate at the base and palmately nerved, entire, herbaceous. Flowers in racemose or paniculate cl usters, rarely solitary. Bracts leaf-l ike, or minute or subulate. Sepals 5, small in flower, the 3 outer or all accrescent in fruit, scarious, reticulately veined, spreading, often spathulate, falling with the fruit. Corolla regular, white, campanulate or funnel-shaped, rarely salverform, the limb entire or 5-lobed. Style 1, simple or bifid with unequal branches, stigmas globose, solitary or 1 on each branch. Fruit capsular, subglobose to oblong or indehiscent. Seed usually 1, glabrous.