Monotypic Apocynaceae genera

Cylindropsis is a genus of plants first described in 1898. It contains only one known species, Cylindropsis parvifolia, native to central Africa (Nigeria, Cabinda, Gabon, Central African Republic, Republic of Congo, Democratic Republic of the Congo).

Treutlera is a monotypic genus of flowering plants belonging to the family Apocynaceae. It only contains one known species, Treutlera insignis Hook.f.