Abstract
The identity of the Malagasy Kalanchoe rosei (Crassulaceae subfam. Kalanchooideae) is resolved, inter alia through a rigorous review and interpretation of the type of the name, as well as associated preserved and living material. Apart from the autonymic variety, K. rosei var. rosei, two further varieties were at times often recognised, i.e., K. rosei var. seyrigii and K. rosei var. variifolia, both of which are now treated in K. variifolia. However, based on a comprehensive morphological investigation, even within K. rosei var. rosei, the autonymic variety therefore, we conclude that two distinct species can be identified. The one that does not include the type of the name K. rosei is here described as K. perrieri. In addition, as shown here, K. rosei is more closely related to K. peltigera, rather than to the material here described as K. perrieri, while material of K. variifolia is more distantly related. The typification of the names K. rosei and K. bouvieri is clarified.