Abstract
Essential oils of micropropagated Satureja obovata Lag., Thymus serpylloides Bory subsp. serpylloides and T. serpylloides Bory subsp. gadorensis (Pau) Jalas plants (Lamiaceae) have been studied by GC and GC/MS. The composition of the oils obtained from micropropagated plants was less complex than that of plants in the same phenological stage which were collected in the field. Qualitative differences were only found for the minor constituents. The essential oil yield was always higher in the micropropagated plants.