Study and identification compounds of essential oil of Camphorosma monspeliaca in different phonological stages in Arak, Hamedan and Shahr-E-Kord rangelands

Iran ranges have one of the most reach floras in the world that the main part of this flora is medical plants. Many compounds in essential oil of these plants can use in food and medical industries that should attend in multiple use of ranges. One of the medical plants in Iran ranges is Camphorosma monspeliaca L. This research to identification and determination yield of essential oil composition of Camphorosma monspeliaca L. in three main habitat (Arak, Hamedan, Shahr-E-Kord) in two phonological stages including vegetative and flowering stages were done. The results show that the total yield of essential oil changes between 0.1% to 0.2%. Overall 114 components were identified of total essential oil of Camphorosma monspeliaca L. in three mentioned habitats the most components belong to Hamedan and the lowest belong to Arak in flowering stage (Hamedan=103, Shahr-E-Kord=78 Arak=55). Through identified compounds 10 common compounds had the most yields in flowering stage in three areas including