Family, Birthwort. Color of tube, greenish yellow; of limb, brownish purple. Calyx, tubular, bent and curved like a Dutch pipe, 1 1/2 inches long swollen below, narrowed above, with a short, somewhat 3-lobed border. Corolla, none. Stamens, 6, each pair of anthers joining under one of the 3 short, thick, stigmatic lobes of the pistil. Flowers, drooping, on axillary peduncles, a bract clasping the base of the peduncles. Leaves, broad, 6 to 15 inches, roundish or kidney - shape, on petioles 1 to 4 inches long, downy beneath when young, smooth when older. May.
Cultivated and a favorite twining veranda vine in the Northern States, indigenous in rich woods from Pennsylvania southward.