Philadelphus microphyllus, commonly known as Littleleaf Mock-Orange, is a deciduous shrub native to rocky slopes, canyon walls, and desert scrublands in the Southwestern USA and Mexico. It is a highly variable plant with many subspecies, typically forming a rounded, spreading habit and reaching a maximum height of around 2 meters (6 ft 7 in). The young branches are coated in stiff hairs, while older branches feature reddish, yellowish, or gray shredding bark. The pointed oval or lance-shaped leaves, up to 2.5 centimeters (0.98 in) long, are green, sometimes hairy, and oppositely arranged. The inflorescence consists of solitary flowers or clusters of two or three, with fragrant white or cream petals and a cluster of many stout stamens, blooming in late spring to early summer. The fruit is a hard capsule containing many seeds.

Littleleaf Mock-Orange is valued for its fragrant flowers, which are particularly showy and can be a focal point in gardens. It is used in traditional gardens, natural landscape native plant gardens, drought-tolerant water-conserving gardens, and various municipal, commercial, and agency sustainable landscape and restoration projects. This shrub is well-suited to urban planting, border planting, and as a specimen in xeriscapes. It thrives in full sun to part shade, requires low amounts of water, and prefers well-drained soils. While generally disease-resistant, it can occasionally suffer from powdery mildew or rust. Pruning after flowering helps maintain its shape and encourages vigorous growth.CC BY-SA 4.0