Essential oil composition of Dracocephalum kotschyi Boiss. from Iran.

Dracocephalum kotschyi is one of the medicinal and fragrant herbs that can be found in natural locations of mountainous areas. In this investigation the hydrodistilled essential oils obtained from aerial parts of two populations of D. kotschyi collected from Siahbisheh and Baladeh were analysed by capillary GC-FID and GC-MS. Essential oil analysis led to the identification of 48 compounds that represented 85.9 and 90.0% of the total oil compositions, respectively. As the major group of compounds, oxygenated monoterpens comprised 45.5 and 57.4% in the essential oils of compounds as the main group in the essential oils of Siahbisheh and Baladeh samples, respectively. Disagreement in the major contents of the essential oils of these two samples may be ascribed to differences in the ecological, climatic and genetically factors.