The alkaloids of seven of the eight species of Fagara growing in Argentina have been investigated. All the bases isolated and characterized were quaternary and belonged either to the simple phenylethylamines or to the benzylisoquinolines. In the last group one benzylisoquinoline, several aporphines, two berberines and two benzophenanthridine alkaloids were identified (Table 1). Two of them, tembetarine and N-methylcorydine were found for the first time in plants. Some considerations are made on the distribution of these alkaloids among Fagara and Zanthoxylum species.