Shtein, R., Klein, D.-P. and 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 (Apr. 2021), 228–244. DOI:https://doi.org/10.11646/phytotaxa.496.3.2.