Chemical Composition of the Essential Oils of Centaurea formanekii and C. orphanidea ssp. thessala , Growing Wild in Greece

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The volatile constituents of the aerial parts of Centaureaformanekii Halacsy and the aerial parts, capitula and roots of C. orphanidea Heldr. & Sart. ex Boiss. ssp. thessala (Hausskn.) Dostál from Greece were extracted by hydrodistillation and analyzed. The main components in C. formanekii were hexadecanoic acid (13.6%), delta-elemene (9.1%), and spathulenol (6.9%). The main components in C. orphanidea ssp. thessala were gamma-elemene (26.1%) and caryophyllene oxide (13.2%) in the aerial parts, hexadecanoic acid (33.5%) and heptacosane (6.3%) in the capitula, and hexadecanoic acid methyl ester (22.0%) and a-chamigrene (14.0%) in the roots. The chemotaxonomic significance with respect to other previously studied species of the same sections (Phalolepis and Achrolopus, respectively) is discussed.