Smith, G.F. (2020)

Aloe ×retiefii (Asphodelaceae subfam. Alooideae), a new nothospecies from northeastern South Africa, with A. globuligemma and A. marlothii as parents

. Phytotaxa 468 (1): 150–154. https://doi.org/10.11646/phytotaxa.468.1.12