Sideritis phlomoides Boiss. & Bal., S. vulcanica Hub.-Mor., S. vuralii Duman & Bas¸er and S. caesarea Duman, Aytaç & Bas¸er are endemic species in Turkey. Water-distilled essential oils from the flowering spike of these plants were analysed by GC–MS. β-Pinene (35%), 1,8-cineole (15%) and α-pinene (15%) were the main components in the oil of S. vuralii, while β-caryophyllene (8%) and caryophyllene oxide (7%) were the major constituents in the oil of S. caesarea. The oils from S. phlomoides and S. vulcanica were found to contain β-caryophyllene (31% and 10%) as major constituents. α-Bisabolol (16%) was also found as a major component in the oil of Sideritis phlomoides.
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̈mer et al. (1999) studied this question.
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