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.
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