Genera Plantarum by George Bentham and Joseph Hooker is a highly influential work in the history of plant classification. However, the importance of the work for names at the rank of species is equivocal. Bentham and Hooker proposed transferring many species to different genera without making the required new combinations. Many such supposed combinations were attributed to Genera Plantarum, particularly in Index Kewensis. Species names attributed to Genera Plantarum are reviewed herein. Typification of species described in Genera Plantarum is also analysed. Many citations of the valid publication of combinations are listed that should replace the incorrect ones still given in reference works. Simira podocarpa (Benth.) I.M. Turner, comb. nova and Erigeron emodi I.M. Turner, nom. nov. are proposed. Litsea elongata (Nees) Benth. ex Hook. f. is a later homonym that should be replaced by Litsea faberi Hemsl. Peucedanum diversifolium H. Wolff is not a later homonym and should be used rather than P. chinense M. Hiroe.