Plant volatiles providing additional evidences to the occurence of a wild-growing population of Calamintha vardarensis (Greuter et Burdet) Šilić outside of its natural habitat.

The essential-oil profile of a Calamintha species, wild-growing in the urban settings of the city of Niš (South Serbia) and botanically tentatively identified as C. vardarensis (endemic species native to FYR Macedonia and East Serbia), has been statistically (multivariate statistical analyses) compared with those of other Calamintha species, including two previously investigated C. vardarensis populations, as a means of corroboration of the surprising occurence of this Calamintha population outside of its natural distributional range. Agglomerative hierarchical clustering reveals a close link of C. vardarensis from Niš (with neo-menthol (40.0%), menthone (21.8%), and pulegone (27.2%) as its major oil contributors) and C. vardarensis from FYR Macedonia.