G. F. Smith, “The taxonomy and nomenclature of Kalanchoe ×kewensis [K. bentii × K. glaucescens] (Crassulaceae subfam. Kalanchooideae), a nothospecies produced at the Royal Botanic Gardens, Kew, in the early 1900s”, Phytotaxa, vol. 618, no. 3, pp. 274–282, Oct. 2023.