Smith, G. F. 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 2023, 618, 274-282.