Large twiners. Stem, peduncles and petioles
often winged. Leaves entire, angular or digitate, often cordate base. Flowers
axillary cymes, bracteate, caducous. Corolla broadly funnel-shaped to
campanulate, white or yellow. Stamens included, spirally twisted. Ovary
2-celled, 2-ovules in each, style 1, filiform, stigma bi-globular. Fruit a
capsule, circumscissile in or above middle. Seeds 4 or less, blackish,
trigonous, globular, glabrous or pilose edges.