is a medium-sized shrub, which produces freely branching stems that become woody with age; they are generally hairless, and somewhat sticky. The leathery leaves are quite distinctive; they are long and narrow, lined by large edge teeth, and are usually sticky on the upper surface. Leaves are colored dark green with a yellowish midvein, and they may be sessile or have a short stalk.
Flowers are formed of a small, green, sparsely hairy, five-lobed calyx and a larger white, funnel-shaped corolla, densely short hairy on the outer surface; the corolla opens to five founded lobes, revealing the two styles and five stamens, which have greenish white filaments and relatively large purple anthers. The stamens are not exserted.