Philadelphus lewisii (Lewis's Mock-orange) is a deciduous shrub which is native to the western United States, from northwestern California in the Sierra Nevada, north to Washington in the Cascade Range, and east to Idaho and Montana.

It is generally less than 2 m tall. Its flowers are white, 2-3 cm wide and smell like orange blossoms.

Other names include "wild mock-orange" (though this applies to any species in the genus), and "Syringa", a confusing name as it usually refers to the unrelated lilacs.

Cultivation

It likes full sun to partial sun. It is garden tolerant and drought tolerant.

Wild mock-orange is the state flower of Idaho.

References

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• Jepson treatment
• USDA Plants Profile: Philadelphus lewisii

Cornales | Flora of Idaho | Flora of Northwestern United States