I. pandurata is a twining and scrambling vine that can reach 30 ft (9 m). The stems are usually hairless and bear alternate, olive-green, cordate leaves, about 6 in (15 cm) long, with long, purple-tinged petioles. The flowers develop in the axils of the leaves in groups of one to five. The sepals are light green and hairless, and overlap one another. The flowers are tubular, white with a pinkish or purplish throat. The corolla is five-lobed, some 2.5 to 3 in (6.4 to 7.6 cm) long and wide.