Smith, G.F. (2026) The natural hybrid between Aloe arborescens and A. petricola (Asphodelaceae [subfam. Asphodeloideae] tr. Aloeae) described as A. ×attwoodii. Phytotaxa 776 (1): 27–37. https://doi.org/10.11646/phytotaxa.776.1.3