• Echinocactus Link & Otto, 1827
• Echinocactus acanthodes Lem. accepted as Ferocactus cylindraceus (Engelm.) Orcutt
• Echinocactus asterias Zucc. accepted as Astrophytum asterias (Zucc.) Lem.
• Echinocactus bicolor Galeotti ex Pfeiffer accepted as Thelocactus bicolor (Galeotti ex Pfeiffer) Britt. & Rose
• Echinocactus conoideus (DC.) Poselg. accepted as Neolloydia conoidea (DC.) Britt. & Rose
• Echinocactus erectocentrus Coult. accepted as Sclerocactus erectocentrus (Coult.) N.P. Taylor
• Echinocactus flavidispinus (Backeberg) Weniger accepted as Thelocactus bicolor (Galeotti ex Pfeiffer) Britt. & Rose
• Echinocactus glaucus (J.A. Purpus ex K. Schum.) L. Benson accepted as Sclerocactus glaucus (J.A. Purpus ex K. Schum.) L. Benson
• Echinocactus hamatacanthus Muehlenpfordt accepted as Ferocactus hamatacanthus (Muehlenpfordt) Britt. & Rose
• Echinocactus horizonthalonius Lem.
• Echinocactus intertextus Engelm. accepted as Sclerocactus intertextus (Engelm.) N.P. Taylor
• Echinocactus johnsonii Parry ex Engelm. accepted as Sclerocactus johnsonii (Parry ex Engelm.) N.P. Taylor
• Echinocactus lecontei Engelm. accepted as Ferocactus cylindraceus (Engelm.) Orcutt
• Echinocactus mariposensis (Hester) Weniger accepted as Sclerocactus mariposensis (Hester) N.P. Taylor
• Echinocactus mesae-verdae (Boissevain ex Boissevain & C. Davids.) L. Benson accepted as Sclerocactus mesae-verdae (Boissevain ex Boissevain & C. Davids.) L. Benson
• Echinocactus papyracanthus Engelm. accepted as Sclerocactus papyracanthus (Engelm.) N.P. Taylor
• Echinocactus peeblesianus accepted as Pediocactus peeblesianus (Croizat) L. Benson
• Echinocactus polyancistrus Engelm. & Bigelow accepted as Sclerocactus polyancistrus (Engelm. & Bigelow) Britt. & Rose
• Echinocactus polycephalus Engelm. & Bigelow
• Echinocactus scheeri Salm-Dyck accepted as Sclerocactus scheeri (Salm-Dyck) N.P. Taylor
• Echinocactus setispinus Engelm. accepted as Thelocactus setispinus (Engelm.) E.F. Anderson
• Echinocactus sileri accepted as Pediocactus sileri (Engelm.) L. Benson
• Echinocactus simpsonii Engelm. accepted as Pediocactus simpsonii (Engelm.) Britt. & Rose
• Echinocactus sinuatus A. Dietr. accepted as Ferocactus hamatacanthus (Muehlenpfordt) Britt. & Rose
• Echinocactus subglacus accepted as Sclerocactus glaucus (J.A. Purpus ex K. Schum.) L. Benson
• Echinocactus texensis Hopffer
• Echinocactus tobuschii (W.T. Marsh.) Weniger accepted as Sclerocactus brevihamatus (Engelm.) D.R. Hunt
• Echinocactus viridescens Torr. & Gray accepted as Ferocactus viridescens (Torr. & Gray) Britt. & Rose
• Echinocactus warnockii (L. Benson) Weniger accepted as Sclerocactus warnockii (L. Benson) N.P. Taylor
• Echinocactus whipplei Engelm. & Bigelow accepted as Sclerocactus whipplei (Engelm. & Bigelow) Britt. & Rose
• Echinocactus wislizeni Engelm. accepted as Ferocactus wislizeni (Engelm.) Britt. & Rose
• Echinocactus xeranthemoides (Coult.) Engelm. ex Rydb. accepted as Echinocactus polycephalus Engelm. & Bigelow