Two new C19-diterpenoid alkaloids, falconericine (1) and falconeridine (2) have been isolated from the roots of Aconitum falconeri Stapf. and their structures deduced by spectroscopic methods and chemical correlation with alkaloids of established structures. A third alkaloid, falconeridinine (3) is likely an artefact of the isolation conditions. It has been synthesized by refluxing a solution of falconerine-8-acetate in ethanol.