The Study of Essential oil of Hymenocrater longiflorus Benth Growing in Paveh

The genus Hymenocrater, belong to the Lamiaceae family, consist of 21 species throughout the world. In Iran, about 9 species are present, of which some are endemic. Plants belonging to these genuses are pharmacologically active and have been used in folk medicine all around the world. The aim of the present study was to detect the essential oils composition of Hymenocrater longiflorus Benth. collected from Paveh, Kermanshah province. Plant sample was dried in shade condition and the essential oil of the plant obtained by hydrodistillation by Clevenger type apparatus was analyzed by GC/MS. Yield of essential oil was (1.5 % v/w). The major components of the oil of H. longiflorus Benth were Hedycaryol (22.2), ?-Cadinol (20.43), B-Bourbonene (5.76%), ?-Terpineol (4.95%), Eudesmol < 7-Epi- > (4.84%), B-Bourbonene (4.69%), Caryophylene oxide (4.32%) and Geijerene (4.08%), Caryophelen (2.99), Sabinene (2.6%), 1,8-Cineole (2.58%), ?-Amorphene (2.58%), ?-Caddinene (2.24%) and ?-Pinene (2.07%) were the main compounds with the greatest content.