mock-orange noun 16forms 1 noun16 •Any of many shrubs of the genus Philadelphus having white, fragrant flowers, for which they are cultivated outside their natural range •Any shrub of the genus Philadelphus, particularly Philadelphus coronarius (sweet mock orange). •especially, Philadelphus coronarius (sweet mock orange), widely cultivated •Philadelphus lewisii (Lewis' mock-orange), of western North America •Bursaria spinosa (Australian blackthorn), a small tree from Australia. •Choisya ternata (Mexican orange), an aromatic shrub native to North America. •Any of several similar but not closely related plants. •Maclura pomifera (Osage orange), a small tree from North America. •Bursaria spinosa (Australian blackthorn) •Murraya paniculata (orange jessamine), a small tree ranging from East Asia to Australasia. •Maclura pomifera (Osage orange), of North America •Pittosporum undulatum (sweet pittosporum), a small tree native to Australia. •Murraya paniculata (orange jessamine), a small tree ranging from East Asia to Australasia •Pittosporum tobira, native to China, Japan, and Korea, and naturalized and cultivated elsewhere •Pittosporum undulatum (sweet pittosporum), of Australia •Styrax americanus (American snowbell) formsmock oranges