Subspecies, varieties, forms and cultivars of plants belonging to the Arrojadoa rhodantha group

• Arrojadoa rhodantha Britton & Rose: has cylindrical stems over one metre long. Spines mostly brown. The tubular violet-red flowers are produced in clusters from a cephalium at the top of the joints. Distribution: Brazil, (Bahia, Piauí, Pernambuco, Minas Gerais and Goias).
• Arrojadoa rhodantha var. anguinea (P.J.Braun & Esteves) P.J.Braun & Esteves
• Arrojadoa rhodantha subs. aureispina (Buining & Bredero) P.J.Braun & Esteves: has golden-yellow spines. Distribution: Brumado, Bahia, Brazil.
• Arrojadoa rhodantha subs. canudosensis (Buining & Bredero) P.J.Braun
• Arrojadoa rhodantha var. guanambensis (P.J.Braun & Heimen) P.J.Braun & Esteves
• Arrojadoa rhodantha var. occibahiensis P.J.Braun
• Arrojadoa rhodantha subs. reflexa P.J.Braun
• Arrojadoa rhodantha var. theunisseniana (Buining & Bredero) P.J.Braun