Abstract Water-distilled essential oils from the aerial parts of Micromeria persica Boiss., leaves and stems of Hymenocrater platystegius Rech. f., which are endemic to Iran, and the aerial parts of Scutellaria pinnatifida A. Hamilt. subsp. pinnatifida were analyzed by GC and GC/MS. Twenty-four components representing 96.1% of the oil of M. persica were identified of which linalool (15.2%), Î±-pinene (15.0%) and (E)-nerolidol (13.8%) were found to be the major constituents. Seventeen compounds representing 91.7% of the leaf oil and 10 compounds representing 90.7% of the stem oil of H. platystegius were identified. Both oils were rich in Î±-pinene (16.7% and 18.6%, respectively) and spathulenol (17.1% and 17.9%, respectively). The other main component of the leaf oil was 1,8-cineole (12.9%), and of the stem oil, cis-calamenene (11.2%). Methyl chavicol (81.9%) was the main component among the 11 constituents characterized in the oil of S. pinnatifida representing 100% of the total components detected.