Investigation on Chemical Constituents of Essential oils from Achillea wilhelmsii C. Koch from two local by Distillation methods

The compostion of the oils from flower and leaf of Achillea wilhelmsii C. Koch were collected during the flowering priod from 15 km away from Esfhan on alt. 1650 m. in July 2003. The essential oils were obtained by different methods of distillation (steam distillation and hydrodistillation), the percentage of oils for flower were 0/17% and 0.25% respectively, and calculated on the dry weight, and analysis by GC and GC/MS. The major constituents determined by hydrodistillation method in flower were p–cymene (33.3%), terpinolene (11.2%) and a-thujene (10.9%) and by steam distillation method in flower were p – cymene (22.1%), germacrene B (11%) and terpinolene (9.8%), respectively.