Habit: this is an erect, open and spreading shrub with a fibrous root system and light brown bark that peels away in strips. Leaves are dark green and opposite, sometimes with small hairs below, margins either entire or with widely spaced shallow teeth. The fragrant flowers are borne singular along the stem or in small clusters at the tips of branches. Four creamy white petals surround a multitude of pale yellow stamen. Fruit is a small dark brown capsule. Blooms from late spring to mid summer.
Ecology: found in the Pacific Northwest and eastward into Montana, Philadelphus lewisii prefers riparian zones, north and east facing canyon slopes, and forest openings, usually under 4900 ft (1500 m).
Growing Conditions: full sun to partial shade, in well-drained moist soil to dry soil. Drought tolerant once established.
Mock orange is the state flower of Idaho. Can be used as a hedge, is fire tolerant, and can be planted on slopes having erosion issues. Excellent cover and habitat for wildlife. Captain Meriwether Lewis first collected the plant in 1806.