The major compounds of essential oils were thymol, carvacrol, p-cymene, and y-terpinene, respectively, with an average of 28.77%, 25.31%, 14.02%, and 8.12%. The correlations between the factors were calculated based on the Pearson correlation coefficient. Therefore, macro environmental factors were determined by the PCA method. The essential oil of samples was analyzed by gas chromatography (GC) and gas chromatography-mass spectroscopy (GC-MS). were collected from various natural habitats in the southwest of Iran. The aerial parts of 25 wild populations of Oliveria decumbens Vent. The aim of the present study was to determine the effect of macro environmental factors on essential oils content and composition of Iranian populations of Oliveria decumbens. Environmental factors may affect qualitative and quantitative properties of essential oil in medicinal plants.
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