It's native to India and Southeast Asia, and its bark contains a poison called brucine, but the real lethality comes from the trees round green-to-orange fruit which contains the alkaloid strychnine.

马钱子原产印度与东南亚，它的树皮富含称为 Brucine 的有毒生物碱。但真正会死人的部分是马钱子-圆圆的，绿色到橙色的果实含有有毒生物碱：马钱子碱。