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The genus  Teucrium  L. (Lamiaceae) is a genus growing in mild climate zones, particularly in the Mediterranean Basin and Central Asia. It is represented by 11 taxa in Sardinia (Italy), living commonly in sunny habitats. In this study, the following eight Sardinian  Teucrium  taxa were selected, and the essential oils (EOs), obtained by stem distillation, were analyzed by GC–FID and GC–MS:  T. capitatum  subsp.  capitatum , T.  chamaedrys  subsp.  chamaedrys ,  T. flavum  subsp.  glaucum ,  T .  marum ,  T. massiliense ,  T. scordium  subsp.  scordioides ,  T. scorodonia , and  T. subspinosum . The comprehensive analyses led to the identification of 87 constituents representing the majority of the volatile compounds. Significant differences, both qualitative and quantitative, were observed between the taxa. Overall, monoterpenes and sesquiterpenes characterized all  Teucrium  EOs:  T. capitatum  subsp.  capitatum  and  T. flavum  subsp.  glaucum  revealed the highest content of monoterpene hydrocarbons, while in the other  Teucrium  taxa sesquiterpene hydrocarbons prevailed. Worthy of note, diterpenes were found only in  T .  marum  and  T. subspinosum , whereas  T. massiliense  was rich in non-terpenic oxygenated compounds. To the best of our knowledge, this is the first comprehensive report on the chemical composition of EOs obtained from Sardinian  Teucrium  species.

Characterization of Essential Oils from Different Taxa Belonging to the Genus Teucrium in Sardinia Island, Italy