Abstract The composition of the essential oils from three Umbelliferae species of IranâAzilia eryngioedes (Pau) Hedge et Lamond, which is endemic to Iran, Laser trilobum (L.) Borkh. and Falcaria falcarioides (Bornm. et Wolff) Wolffâobtained by hydrodistillation were analyzed by GC/MS. Bornyl acetate (40.9%) was the main component among the 26 constituents characterized in the oil of A. eryngioedes, representing 93.8% of the total components detected. Eighteen compounds were identified in the oil of L. trilobum, representing 85.2% of the total oil, with Î²-caryophyl- lene (22.3%), myrcene (21.7%) and Î²-sesquiphellandrene (19.2%) as the major constituents. The oil of F. falcarioides was characterized by a higher amount of germacrene B (67.9%) among the 24 components comprising 97.6% of the total oil detected.