Essential Oil Composition of Different Plant Parts from Croatian Petasites albus (L.) Gaertn. and Petasites hybridus (L.) G.Gaertn., B.Mey. & Scherb. (Asteraceae).

Essential oil compositions of fresh leaves, flower stems and rhizomes obtained by hydrodistillation from different Croatian populations of Petasites albus (L.) Gaertn. and Petasites hybridus (L.) G.Gaertn., B.Mey. & Scherb. (four of each species) were investigated using gas chromatography-flame ionization detection and gas chromatography-mass spectrometry. Altogether, 118 constituents were identified, accounting for 81.19-96.81 % of total oil composition. All essential oils were characterized by oxygenated sesquiterpenes, with distinct compounds recorded for both investigated species. Clear separation between the two species was confirmed by principal component analysis and hierarchical cluster analysis. This is the first study that recorded intraspecific variations of essential oil constituents from P. albus and P. hybridus. Obtained results could contribute to the understanding of their medicinal and nutritional value.