To evaluate the variation in the essential oil quality of 12 damask rose genotypes under mulched rainfed condition, this experiment was conducted in 2010, at Homand Research Station of Upland Farming, Absard-Damavand, Iran. The experiment was conducted in the form of a randomized complete block design with three replications. The 12 genotypes of damask rose were indigenous to Ardebil, Ilam, Tehran, Chaharmahal-o-Bakhtiari, Fars, Kerman, Kermanshah, Arak, Hormozgan and Esfehan provinces, Iran. Citronellol, geraniol, n-nonadecane and phenylethyl alcohol, which are the main compounds in the essential oil of damask rose, were evaluated in this experiment. Results indicated the significant variation of the four compounds percentage and yield between the 12 genotypes. Mean comparison showed that citronellol and n-nonadecane yield were the highest in Ilam genotype, geraniol yield was the highest in Fars genotype and phenylethyl alcohol yield was the highest in Arak genotype.
