sentences:  Ajmaline can be found in most species of the genus "Rauvolfia" as well as "Catharanthus roseus".In addition to Southeast Asia, "Rauvolfia" species have also been found in tropical regions of India, Africa, South America, and some oceanic islands.Other indole alkaloids found in "Rauvolfia" include reserpine, ajmalicine, serpentine, corynanthine, and yohimbine.