en Herbal Drugs گزارش مورد Case report <span style="font-size:10pt"><span style="line-height:150%"><span style="font-family:Optima"><span style="color:black"><i>Perovskia.atriplicifolia</i>.Benth is an extensive <a href="https://en.wikipedia.org/wiki/Ethnomedicine" title="Ethnomedicine"><span lang="EN" style="color:black"><span style="text-decoration:none"><span style="text-underline:none">ethno medical</span></span></span></a> tradition, the <a href="https://en.wikipedia.org/wiki/Phytochemistry" title="Phytochemistry"><span lang="EN" style="color:black"><span style="text-decoration:none"><span style="text-underline:none">photochemistry</span></span></span></a> of this plant has been the topic of several studies. The purpose of this research is investigating the variation in the essential oil composition of <i>Perovskia. atriplicifolia</i> plant at the different growth stages from Taftan mountain .The leaves of <i>P.&nbsp;atriplicifolia</i> were harvested before flowering, flowering, and after flowering stages.The essential oils were extracted by hydro distillation method which were analyzed by the GC & GC-MS techniques. Oil yields (w/w%) related at three stages of plant growth were in the order of: before flowering (1.28), flowering (1.15), &nbsp;and after flowering (1.03). In total 52, 62, and 43 components were identified using Kovats indices and quantified in the oils of the before flowering, flowering and after flowering stages representing 92.0 %, 86.31%, and66.46 % &nbsp;&nbsp;respectively. The higher percent of which: geranyl acetate, 1,8-cineole, <span cambria="" style="font-family:">&delta;</span>-3-carene ,trans-caryophyllene, bornyl acetate ,camphene,valeranone,<span cambria="" style="font-family:">&alpha;</span>-pinene,were the main compounds in all oil samples.Total terpenoids were the main group of compounds in the before flowering (91.58 %), flowering (84.03 %) and after flowering stages (65.72 %) respectively. The before flowering stage essential oil is of the best quality.</span></span></span></span><br> &nbsp; ,Perovskia.atriplicifolia,Essential oil composition,Geranyl acetate,δ -3-Carene,1,8- Cineole 26 33 http://pbp.medilam.ac.ir/browse.php?a_code=A-10-224-4&slc_lang=en&sid=1 Alireza Sardashti asardashti65@gmail.com 10031947532846001106 0000000303271183 No University of Sistan and Baluchestan Alireza Sardashti alirezasardashti52@yahoo.com 10031947532846001107 0000000303271183 Yes University of Sistan and Baluchestan