Isonema is a genus of plant in the family Apocynaceae first described as a genus in 1810. It is native to Africa.World Checklist of Selected Plant Families
Species Isonema buchholzii Engl. - Nigeria, Cameroon Isonema infundibuliflorum Stapf - Cameroon, Gabon, Zaire Isonema smeathmannii Roem. & Schult. - W Africa (Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Senegal, Sierra Leone)
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