The Osage orange tree.
Maclura pomifera (Osage orange), a small tree from North America.
Bursaria spinosa (Australian blackthorn), a small tree from Australia.
Murraya paniculata (orange jessamine), a small tree ranging from East Asia to Australasia.
Choisya ternata (Mexican orange), an aromatic shrub native to North America.
Any shrub of the genus Philadelphus, particularly Philadelphus coronarius (sweet mock orange).
Pittosporum undulatum (sweet pittosporum), a small tree native to Australia.