Vincetoxicum oblongum

Vincetoxicum oblongum is a species of plants in the family Apocynaceae, native from west tropical Africa to south-west Ethiopia. Its synonyms include Oncostemma cuspidatum, at one time placed as the only species in the genus Oncostemma.

Distribution
Vincetoxicum oblongum is native to tropical Africa: Benin, Burkina Faso, Cameroon, Ethiopia, Gabon, Guinea, the Gulf of Guinea Islands, Ivory Coast, Liberia and Nigeria.