Révision taxonomique du groupe de plantes du sud malgache appartenant au complexe Aloe deltoideodonta Baker (Asphodelaceae)

This article reviews the taxonomy of the plants in the Aloe deltoideodonta Baker complex (Madagascar) native to southern Madagascar. We begin by recalling the succession of errors that have affected this group, and then proceed to make the necessary taxonomic changes. Following confirmation by the Nomenclature Committee of the illegitimacy of the name A. horombensis J.-P.Castillon in favour of A. subacutissima G.D.Rowley, certain former subspecies of A. horombensis (or varieties of A. deltoideodonta) are transferred to the name A. subacutissima (A. horombensis subsp. ruffingiana (Rauh & Petignat) J.-P.Castillon and A. horombensis subsp. amboahangyensis Rebmann) while others are elevated to species status: Aloe albescens J.-B.Castillon & J.-P.Castillon, nom. nov. to replace A. deltoideodonta var. candicans H.Perrier, to which is transferred the variety A. deltoideodonta var. fallax J.-B.Castillon and Aloe andavakana J.-B.Castillon & J.-P.Castillon, nom. nov. for A. horombensis subsp. andavakana J.-P.Castillon nom. illeg.