Smith, G. F., Klopper, R. R., Crouch, N. R. and Figueiredo, E. (2021) “Reinstatement of Aloe davyana var. subolifera (Asphodelaceae subfam. Alooideae), a distinctive variety of an endemic South African aloe”, Phytotaxa. Auckland, New Zealand, 482(2), pp. 208–212. doi: 10.11646/phytotaxa.482.2.9.