Philadelphus Microphyllus, Littleleaf Mock Orange

Philadelphus microphyllus is a small shrub, typically 2 to 4 feet high, with thin, arching branches bearing grey and/or reddish brown bark, and usually covered with appressed hairs, often red at the base. Leaves are attached by very short stalks, and are greyish-green underneath, due to a covering of short hairs, spreading or appressed, and brighter green on top, where hairs are more sparse.

Flowers are formed of four yellowish-green sepals, sparsely hairy to glabrous, and four longer (up to 0.7 inches) and broader white petals, which have slightly irregular margins. At the center of the flower is a group of four club-shaped styles and up to 60 stamens. Flowers are usually solitary. Four varieties of philadelphus microphyllus are recognized, differing primarily in the type and orientation of the hairs on the leaves and sepals.