Defi nition: Eucalyptus oil is obtained by steam distillation and rectifi cation of the fresh leaves or the fresh terminal branchlets of various species of Eucalyptus rich in 1,8-cineole. The species mainly used are Eucalyptus globulus Labill., Eucalyptus polybractea R.T. Baker, and Eucalyptus smithii R.T. Baker.
Defi nition: Cassia oil is obtained by steam distillation of the leaves and young branches of Cinnamomum cassia Blume (Cinnamomum aromaticum Nees).