For each plant, a listing (monograph) provides information on the origins of the plant from which an essential oil is derived.

Are then listed the major compounds found in the essential oil of the plant. For more information, on each monograph, a link allows you to access a list of natural constituents contained in the plant, with their respective concentrations, and recognized biological activities.

The properties described are compiled from information provided by the best-known traditional uses of the oil, and verified by modern scientific data from databases of phytochemistry and ethnobotany.