Abstract
Twenty-five samples of Thymus pulegioides L. representing two varieties of subsp. silvestris and four varieties of subsp. pulegioides were collected from 11 localities in Lithuania and the composition of their essential oil was analysed by capillary gas chromatography (GC) and mass spectrometry (MS). Five chemotypes have been defined for the species using hierarchical cluster analysis: (1) linalool (L)—one sample; (2) geranial/geraniol/neral (G/G/N)—11 samples; (3) thymol (T)—two samples; (4) carvacrol/γ-terpinene/ p-cymene (C/γT/pC)—seven samples; (5) thymol/carvacrol/ p-cymene/γ-terpinene (T/C/pC/γT)—four samples. It was concluded that there is no clear relation in essential oil composition between the studied taxa and the chemical types detected. Four different chemotypes were defined within the subsp. s ilvestris var. conglomeratus, three chemotypes within the subsp. pulegioides var. pulegioides and var. ovatus. The G/G/N-chemotype is the most frequently found, followed by the phenolic types, the linalool chemotype being recorded only once. Both infra-specific and intra-population chemical polymorphisms were recorded.
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