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The essential oils of Phlomis rigida Labill. and P. samia L. (Lamiaceae) obtained from the aerial parts by hydrodistillation were analyzed by GC and GC/MS. P. rigida (albino and normal form) oils were found to be rich in β-caryophyllene (31.2% and 38.7%, respectively) and β-selinene (13.1% and 15.1%, respectively). P. samia oil contained germacrene D (33.8%) and β-caryophyllene (6.4%) as major components.
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Demırcı et al. (2006) studied this question.
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