Neolloydia macdowelii (Rebut ex Quehl) H. E. Moore
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Neolloydia Britton & Rose)
Notocactus neo-ottoianus var. tenuispinus (Link & Otto) Y. Itô
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Notocactus neo-ottoianus Y.Itô)
Notocactus sessiliflorus f. tetracanthus (Lem.) Neduchal
Homotypic synonym according to GBIF classification (Originally found in sources as synonym of Wigginsia sesseliflora (Mackie ex Hook.) D.M.Porter)
Notocactus tetracanthus (Lem.) N. Gerloff, Neduchal & S. Stuchlik
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Parodia Speg.)
Sclerocactus unguispinus var. durangensis (Runge) N. P. Taylor
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Sclerocactus unguispinus (Engelm.) N.P.Taylor)
Stenocactus acroacanthus (D. C. Stieber) W. T. Marshall & T. M. Bock
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Stenocactus (K.Schum.) A.Berger)
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Strombocactus Britton & Rose)
Thelocactus durangensis (Ruenge) G. D. Rowley
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Thelocactus Britton & Rose)
Thelocactus setispinus var. cachetianus (Labour.) Pilbeam
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Thelocactus setispinus (Engelm.) E.F.Anderson)