Discocactus hartmannii subsp. giganteus P.J.Braun & Esteves in Succulenta (Netherlands) 75: 260. 1996 Discocactus hartmannii subsp. giganteus P.J.Braun & Esteves in Succulenta (Netherlands) 75: 260. 1996Taxon for this nameDiscocactus hartmannii subsp. giganteus P.J.Braun & Esteves