Leaves are large, smooth and opposite with sticky white sap from petiolar glands.

The large white fragrant flowers are borne in corymbs terminal and in the leaf axils.

Stamens are attached near the base of the corolla tube and have slender filaments with arrow-shaped anthers.

The seeds are compressed, apex gradually narrows with a silky coma (a tuft of hairs).

They are found planted and trained as vines in subtropical climate gardens, such as in Southern California.