Abstract
The water distilled essentials oil from the aerial parts of Calamintha betulifolia Boiss. et Bal. collected from three different localities in Turkey were analyzed by GC and GC/MS. Fifty six to seventy nine components representing 80.6–93.0 % of the oils were characterized. Pulegone (26–54 %) was found as the main constituent. The antimicrobial effects of C. betulifolia essential oil are reported here for the first time