(Heterostemma luteum)
Heterostemma luteum is an oleand vegetable species described by Julien Noël Costantin . Heterostemma luteum is part of the Heterostemma genus and the Apocynaceae family. Heterostemma is a genus of plants in the Apocynaceae, first described in 1834. It is native to India, China, Southeast Asia, Australia, and certain islands in the Pacific.