The isolation and identification of 12 alkaloids from an extract of the roots of Thalictrum isopyroides is described. The alkaloids isolated are the aporphines ocoteine (thalicmine), thaliporphine, preocoteine, N-methyllaurotetanine, delporphine, isoboldine, N-methylcassythine and magnoflorine, the dehydroaporphine, dehydroocoteine, the oxoaporphine, thalicminine, and the bisbenzylisoquinolines, thaligosinine and thalisopidine. © 1986.