Fig. 2
PCA of chemical classes for S. officinalis, T. capitatus, R. officinalis1, R. officinalis2 and O. majorana essential oil. m-hyd, Monoterpene hydrocarbons; m-oxi, Monoterpene oxides; m-alc, Monoterpene alcohols; m-ket, Monoterpene Ketones; m-ald, Monoterpene aldehydes; m-est, Monoterpene esters; m-eth, Monoterpene ethers; m-phe, Monoterpene phenols, ses-hyd, Sesquiterpene hydrocarbons; ses-alc, Sesquiterpene alcohols; ses-oxi, Sesquiterpene oxides;n-ide, Not identified. For the Lamiceae species (
) abbreviations see Table 2