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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 (Sep. 2026), 27–37. DOI:https://doi.org/10.11646/phytotaxa.776.1.3.