The taxonomy and nomenclature of Kalanchoe dinklagei Rauh and K. brevisepala (Humbert) L.Allorge (Crassulaceae), of which the basionym is K. millotii Raym.-Hamet & H.Perrier subsp. brevisepala Humbert, are assessed and discussed. We concur with an earlier view that at species rank K. brevisepala should be included in the synonymy of K. dinklagei. We clarify and correct the nomenclature associated with these two species names, as well as that of K. millotii subsp. brevisepala. We also provide an overview of the possible introduction of K. dinklagei into various living plant collections in Europe.