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ABSTRACT
Essential oils of Thymus hyemalis Lange collected from southeastern Spain were checked for chemical variability using gas chromatography (GC), infrared, and gas chromatography-mass spectrometry (GC-MS). Most of the sampled populations could be grouped as phenolic chemotypes, although a few of the populations included non-phenolic groups. A high concentration of linalool was noted in one population. Within the phenolic groups, thymol was predominant over carvacrol. Principal component analysis and cluster analysis of chemical variability enabled separation of closely related phenolic from non-phenolic groups. Multidimensional scaling analysis of essential oil components suggested a relative incompatibility within plant groups and populations.