Climbers, shrubs or trees, usually twining but sometimes prostrate or floating. Leaves variable in shape and size, entire, lobed or divided or rarely compound. Flowers mostly in axillary, 1-to many-flowered dichasia, rarely paniculate. Sepals herbaceous to subcoriaceous, glabrous or pubescent. Corolla regular or slightly zygomorphic, mostly funnel-shaped or campanulate,less often tubular or salverform. Fruit globose or ovoid, capsules mostly 4-valved. Seeds glabrous to pubescent.