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In the present study, the chemical composition of the essential oil from aerial parts of the Balkan endemic,  Centaurea immanuelis-loewii  Degen (sect.  Acrocentron , Asteraceae), collected in Bulgaria was evaluated by GC-MS. The main components of the oil were β-caryophyllene (23.2%), germacrene D (13.7%) and caryophyllene oxide (12.4%). Furthermore, a complete literature review on the composition of the essential oils of all the other taxa of  Centaurea , belonging to section  Acrocentron , studied so far, was performed and the chemotaxonomical variations in the composition of the essential oils is discussed.

The essential oil composition of Centaurea immanuelis-loewii Degen growing wild in Bulgaria and chemotaxonomy of section Acrocentron