Shtein, R., Klein, D.-P. & Smith, G.F. (2021)

A new status for two varieties previously included in the southern Malagasy Kalanchoe rosei, now included in K. variifolia (Crassulaceae subfam. Kalanchooideae)

. Phytotaxa 496 (3): 228–244. https://doi.org/10.11646/phytotaxa.496.3.2