On the other hand, a T. pannonicus population, which is located over the southern slopes of Vršac Mountains in southern Banat (Vojvodina province, Serbia) was characterised by exceptionally high percentage of oxygenated monoterpenes (91.75%). The most abundant components of its essential oil were identified as geranial (41.42%, w/w) and neral (29.61%, w/w), the mixture of which is frequently referred to as citral.