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Abstract
Thymus jankae Cel. and Thymus pulegioides L. subsp. montanus (W.K.) Ronn growing wild in Kosovo have been analyzed for their volatile chemical profile using GC-MS technique. The essential oil of the plants was obtained by hydrodistillation with Clevenger apparatus. Essential oil of two samples of T. jankae Cel. resulted with yields of 0.60 % and 0.72 % respectively, while T. pulegioides L. essential oil yield was 1.58 % on dried weight. Exactly fifty-eight compounds were identified in all three samples. Two chemotypes resulted from the studied T. jankae Cel. essential oil samples: thymol chemotype with 45.78 % of thymol, and β-caryophyllene/caryophyllene oxide chemotype, with 33.25 % and 21.83 %, respectively. The chemical profile of the essential oil sample of T. pulegioides L. resulted with geraniol as the main constituent, with 34.52 % in total. Presented results confirm the influence of environmental and phenological conditions on the chemical composition.