Smith, G.F., Klein, D.-P. and Shtein, R. 2021. A revision of the Malagasy Kalanchoe subg. Kitchingia (Crassulaceae subfam. Kalanchooideae): history, taxonomy, and nomenclature. Phytotaxa. 507, 1 (Jun. 2021), 67–80. DOI:https://doi.org/10.11646/phytotaxa.507.1.3.