The eucalyptus is an evergreen tree native to Australia but naturalized to California and the Mediterranean countries. Its leathery blue-green leaves are studded with glands containing a fragrant, volatile oil. There are many species of eucalyptus trees, but the most pleasant-smelling oil is produced by Eucalyptus globulus. In addition to being used for its aroma, eucalyptus oil also has flavoring, pharmaceutical, and antiseptic uses. Eucalyptus oil may also have antibacterial, anti-inflammatory and analgesic properties – people use eucalyptus oil to help treat a wide range of medical conditions.