Composition of essential oils from five endemic Sideritis species

S. argyrea P.H. Davis, S. armeniaca Bornm., S. hololeuca Boiss. et Heldr. Apud Bentham, S. stricta Boiss. et Heldr. Apud Bentham and S. taurica Stephan ex Willd., are endemic species in Turkey. Water-distilled essential oils from the flowering spikes of these plants were analyzed by GC/MS. Major components characterized in the oils of S. argyrea, S. armeniaca, S. hololeuca and S. stricta were alpha-pinene (20%, 39%, 35% and 30%, respectively) and alpha-pinene (14%, 17%, 16% and 13%, respectively). The oil of S. taurica was characterized by alpha-bisabolol (10%) and alpha-pinene (9%) as main constituents.