Abstract
The essential oil obtained by hydrodistillation from two endemic Centaurea L. species (Asteraceae); Centaurea seri:ceae Wagenitz and Centaurea ensiformis P.H Davis from Turkey was analyzed by gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS), simultaneously. Caryophyllene oxide (10 6 %), nonacosane (8.6 %) and hexadecanoic acid (7 %) were the main constituents in the oil of C. sericeae and beta-eudesmol (29.8 %), hexadecanoic acid (8 %) and caryophyllene oxide (7.6 %) were the main constituents in the oil of C. ensiformis.