Abstract
The chemical composition of the essential oil (EO) obtained by hydrodistillation from the leaves of Teucrium yemense Deflers was determined by GC-MS. Twelve compounds accounting to 77.7% of the total oil were identified. Sesquiterpene hydrocarbons (73.9%) were the predominant portion of the oil with delta-cadinene (34.9%), beta-caryophyllene (22.7%), alpha-humulene (6.1%), and alpha-selinene (5.4%) as the main constituents.