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Abstract
The essential oil composition of flowering aerial parts of Centaurea imperialis Hausskn. ex Bornm. (Asteraceae) from Iran was analyzed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) for the first time. Thirty seven constituents constituting 88.6% of the total oil were detected. The sesquiterpene hydrocarbons had the highest contribution. The main compounds were caryophyllene oxide (23.2%), germacrene D (19.7%) and β-caryophyllene (14.1%).