Smith, G.F. and Figueiredo, E. 2020.

Aloe ×engelbrechtii (Asphodelaceae subfam. Alooideae), a new South African nothospecies with A. arborescens and A. hardyi as parents

. Phytotaxa. 464, 3 (Oct. 2020), 252–256. DOI:https://doi.org/10.11646/phytotaxa.464.3.8.