Klopper, Ronell R., Olwen M. Grace, Arrie W. Klopper, Gideon F. Smith, and Abraham E. Van Wyk. 2023. “A Taxonomic Revision of Aloe Sect. Purpurascentes (Asphodelaceae Subfam. Alooideae)”. Phytotaxa 628 (1). Auckland, New Zealand:1-64. https://doi.org/10.11646/phytotaxa.628.1.1.