Essential oil from the roots of the Siberian specie Angelica decurrens (Ledeb.) B. Fedtsch. was obtained by hydro-steam-distillation method. Its component composition was studied in comparison with the European Medicines specie Angelica archangelica L. The similarity of the essential oils compositions was confirmed. The major components of both species are terpenes: α-pinene and β-phellandrene. Essential oils in the A. decurrens and  A. archangelica roots are accumulated in the secondary secretory ducts. The identity of the essential structures of rhizomes of the Siberian A. decurrens and the European A. archangelica  was confirmed.