Volatile oils occur in special secretary cells. These secretary structures are glandular hair as in case of membranes of Piperaceae. Many of them occur in special oil tubes i.e. pericarp of the fruit e.g. vittae of Umbelliferae. Many of them occur in lysigenous or shizogenous cavities as in case of membranes of Pinaceae and Rutaceae.
In the individual plant they may occur in all the tissues i.e. in conifers or in petals of flowers i.e. rose, or in the bark i.e. cinnamon, or in fruit i.e. in coriander, or leaves i.e. mint and peppermint.
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