Eucalyptus tree are native to Australia. There are many species of eucalyptus. Some are the size of an ornamental shrub, and some grow to be giant trees but the most pleasant-smelling oil is produced by Eucalyptus globulus. Its leathery blue-green leaves are studded with glands containing fragrant, volatile oil. The leaves of the eucalyptus plant are available fresh, dried and in liquid extracts. The leaves and oil of the eucalyptus plant are used for medicinal purposes. Eucalyptus oil is available in many products, including liquids and ointments. Eucalyptus extracts are extensively used across the globe in pills, liquids, inhalers and ointments as a cure for several ailments that are general in nature.