1. The alkaloid compositions of young shoots of Berberis integerrima and B. oblonga have been studied. Berbamunine, hydroxyacanthine, magnoflorine, berberine, and palmatine have been isolated. 2. The new monoquaternary bisbenzylisoquinoline alkaloid oblongamine has been isolated from the roots of B. oblonga. 3. The most probable structure of oblongamine has been suggested on the basis of chemical reactions and spectral characteristics. © 1977 Plenum Publishing Corporation.