The presence and distribution of indolic bases in the five Argentinian species of the genus Piptadenia (Leguminosae) are reported. P. macrocarpa Benth., has the highest alkaloid content, and 5-methoxy-N-methyl-tryptamine, bufotenine and N,N-dimethyl-tryptamine, have been isolated. P. excelsa (Gris.) Lillo contains bufotenine and N,N-dimethyltryptamine, but the other three species, P. rigida Benth., P.paraguayensis (Benth). Lindm. and P. viridflora (Kunth.)- Benth. do not contain tryptamine base. © 1964.