A phytochemical investigation of the leaves of Aspidosperma quebracho‐blanco (Apocynaceae) resulted in the isolation of rhazinilam, a new nonindole lactam alkaloid, in addition to the known bases, aspidospermine, quebrachidine, (—)‐pyrifolidine, and akuammidine. Aspidospermine and quebrachidine were the major leaf alkaloids. Akuammidine and (—)‐pyrifolidine were isolated from the leaves for the first time, and the isolation of the latter compound confirms its natural occurrence in this plant. Copyright © 1973 Wiley‐Liss, Inc., A Wiley Company