SummaryExamination of the supplementary portion (1818‐1819) of Rees's Cyclopaedia and the seed‐lists and catalogues of European botanic gardens has revealed some 120 unlisted binomials, several making currently accepted names later homonyms so that Anemia radicans Raddi must be known as A. blechnoides Sm.; A. blechnoides Brade becomes A. spicantoides Mabb.; Aphelandra deppeana Schlecht. & Cham. is A. scabra (Vahl) Sm., Alyssum arenarium Lois. is A. loiseleurii P. Fourn. and Salvia inconspicua Benth. is S. protracta Benth. There may have to be changes in Acacia, Canna, Justicia, Pholiurus and Senecio, while names in Acacia, Acaena, Artemisia, Blechum, Bonapartea, Cassia, Cleome, Coleus, Commelina, Crataegus, Euphorbia, Ipomoea, Lotus, Psoralea and Stevia remain obscure.