The volatile components identified accounted for 71.0-98.8% of the oils composition. the analyzed oils can be classified in four groups according to their chemical make-up.A.cana,A.frigida,A.longifolia,and A. ludoviciana oils contained high amounts of oxygenated monoterpenes(48.8-75.6%),with 1,8-cineold and camphor being the most representative. Camphene and alphapinene were the dominant components in the monoterpene
hydrocardon fractions. The latter oil was also characterized by a high content of the oxygenated sesquiterpenes(17.8%).Davanone along with other sesquiterpenes containing a 5-ethenyltetrahydro-5-methyl-2-fulanyi moiety were present in this fraction Approximately 75.0% of A.iudoviciana oil composition was characterized. The remaining unidentified comonents were mainly sesquiterpenes.