Smith, G. F. (2022).

Kalanchoe ×verdoorniae [K. luciae × K. winteri] (Crassulaceae subfam. Kalanchooideae), a new, large-growing nothospecies from South Africa

. Phytotaxa, 568(1), 72–82. https://doi.org/10.11646/phytotaxa.568.1.5