This monograph is dedicated to the study of the chemistry of aporphinoid alkaloids isolated from Liriodendron, Magnolia and Ziziphus plants which were acclimatized in the conditions of Uzbekistan and the results of scientific research which were studied on field of chemistry by the investigator-author for years are presented and they are summarized. In the pamphlet, the author described the extraction of alkaloids from plants, their identification, and the determination of the chemical structures of new alkaloids using modern physicochemical tests (UV-, IR-, PMR- and mass-spectroscopy) and fine chemical reactions. This scientific pamphlet is an important scientific-literary resource for scientific workers, post-graduate students, as well as high-level students and master's students of universities occupied with the chemistry of biologically active plant substances (natural compounds).