The nomenclature associated with the name Aloe greenii is reviewed. The name was validly published in 1875 by William Robinson, and five years later, in 1880, the same binomial was republished by John G. Baker for what is today interpreted as a maculate aloe endemic to eastern southern Africa. The name A. greenii Baker is therefore a later homonym of A. greenii Rob. However, the descriptive statement included in the protologue of A. greenii Rob. is inadequate to confidently restrict the use of this name to any known species, and its application remains unresolved. A replacement name, A. viridiana Gideon F.Sm. & Figueiredo, is here published for material thus far known as A. greenii Baker.