So many of the plants have been moved, and species now in Pelargonium genus used to be in Geranium genus. This is why Catharanthus plants are still called Vinca, and why Dizygotheca/Plerandra trees are still called Aralia. Coleus has been on a merry-go-round of botanical epithets, but is always going to be called Coleus. So many other examples.