By Tayebeh Biniyaz, Zohreh Habibi, Shiva Masoudi and Abdolhossien Rustaiyan

Abstract: Abstract: The essential oils obtained by hydrodistillation of the aerial parts of Haplophyllum furfuraceum Bge.ex Boiss and H. virgatum Spach., two Rutaceae species endemic to Iran, were analyzed by GC and GC/MS. Thirty-three compounds representing 98.1% of the oil of H. furfuraceum were identified, among which elemol (11.7%) and β-eudesmol (10.1%) were the major components. The oil of H. virgatum was characterized by its richness in 2-nonanone (28.4%) and 2-undecanone (21.5%), which were among the 25 components comprising 90.5% of the total oil detected. Key Word Index: Haplophyllum furfuraceum, Haplophyllum virgatum, Rutaceae, essential oil composition, elemol, β-eudesmol, 2-nonanone, 2-undecanone.

Introduction
The Iranian flora comprises 18 species of Haplophyllum, among which nine species are endemic (1,2). Previous chemical investigation on Haplophyllum species have shown the presence of alkaloids and cumarins (3–8). Previously, we reported the oil composition of H. tuberculatum (Forssk.) A. Juss. and H. rubustum Bge. (9–11). In this paper, we describe the analysis of the oils of two other Hoplophyllum species: H. furfuraceum Bge. ex Boiss. (syn. H. khorassanicum Aell. et Esfand) and H. virgatum Spach. (syn. H. canaliculatum Boiss.), which are endemic in Iran. A literature search did not reveal any reference to previous work on the essential oils of these species.