The genus Solanum (Solanaceae) in southern Africa: subgenus Leptostemonum, the introduced sections Acanthophora and Torva.
In the genus Solanum, subgenus Leptostemonum, section Acanthophora has four representatives in the "Flora of southern Africa" region (South Africa, Lesotho, Swaziland, Namibia and Botswana), namely S. aculeatissimum, S. capsicoides, S. mammosum (cultivated only) and S. viarum. Section Torva has two representatives in southern Africa, namely S. chrysotrichum (S. hispidum) and S. torvum, both of which are naturalized weeds. S. capsicoides, S. viarum and S. torvum have not been listed before for southern Africa. All are introduced species native to the New World. Descriptions, discussions, illustrations and distribution maps of the naturalized species are presented, as well as keys to the species of both sections.