• Gymnocalycium ourselianum (Cels ex Salm-Dyck) Y.Itô
• Echinocactus ourselianus Monv., Cels ex Salm-Dyck
• Gymnocalycium multiflorum var. ourselianum (Cels ex Salm-Dyck) H.Till & W.Till

• Gymnocalycium monvillei (Lem.) Britton & Rose
• Echinocactus monvillei Lem.
• Gymnocalycium monvillei var. coloratum Neuhuber
• Gymnocalycium monvillei var. confusa Neuhuber
• Gymnocalycium monvillei subs. gertrudae (Neuhuber) Neuhuber
• Gymnocalycium monvillei var. gertrudae Neuhuber
• Gymnocalycium monvillei var. orientale Neuhuber
• Gymnocalycium achirasense var. orientale (Neuhuber) V.Gapon
• Gymnocalycium monvillei subs. achirasense var. orientale Neuhuber in H.Till & Neuhuber
• Gymnocalycium monvillei var. safronovii V.Gapon
• Gymnocalycium monvillei var. steineri H.Till
• Gymnocalycium multiflorum f. steineri.
• Gymnocalycium multiflorum (Hook.) Britton & Rose
• Echinocactus multiflorus Hook.
• Gymnocalycium multiflorum var. parisiense (K.Schum.) P.Fourn.
• Echinocactus multiflorus var. parisiensis K.Schum.
• Echinocactus multiflorus f. parisiensis (K.Schum.) Schelle
• Gymnocalycium polyanthum var. parisiense (K.Schum.) Y.Itô
• Gymnocalycium ourselianum (Cels ex Salm-Dyck) Y.Itô
• Echinocactus ourselianus Monv., Cels ex Salm-Dyck
• Gymnocalycium multiflorum var. ourselianum (Cels ex Salm-Dyck) H.Till & W.Till

• Gymnocalycium monvillei subs. achirasense (H.Till & Schatzl) H.Till
• Gymnocalycium achirasense H.Till & Schatzl
• Gymnocalycium horridispinum subs. achirasense (H.Till & Schatzl) G.J.Charles
• Gymnocalycium horridispinum var. achirasense (H.Till & Schatzl) Lodé
• Gymnocalycium monvillei var. chacrasense Neuhuber
• Gymnocalycium achirasense var. chacrasense (Neuhuber) V.Gapon
• Gymnocalycium monvillei subs. achirasense var. chacrasense
• Gymnocalycium monvillei var. echinatum Neuhuber
• Gymnocalycium achirasense subs. echinatum (Neuhuber) V.Gapon
• Gymnocalycium monvillei var. kainradliae Neuhuber
• Gymnocalycium achirasense subs. kainradliae (Neuhuber) V.Gapon
• Gymnocalycium monvillei f. villamercedense H.Till & Neuhuber
• Gymnocalycium achirasense var. villamercedense (H.Till & Neuhuber) V.Gapon
• Gymnocalycium villamercedense F.Ritter

• Gymnocalycium monvillei subs. brachyanthum (Gürke) H.Till
• Echinocactus brachyanthus Gürke
• Gymnocalycium brachyanthum (Gürke) Britton & Rose

• Gymnocalycium monvillei subs. horridispinum (G.Frank ex H.Till) H.Till
• Gymnocalycium horridispinum G.Frank ex H.Till

Notes: Echinocactus ourselianusSN|11444]]SN|11444]] Monville (SalmDyck, Cact. Hort. Dyck. 1849. 34. 1850) is cited by Schumann as a synonym of Gymnocalycium multiflorumSN|11438]]SN|11445]] (Hooker) Britton and Rose Now referred to Gymnocalycium monvilleiSN|11445]]SN|11438]]] , but it was never published; the name was attributed to Cels by SalmDyck.
Its variety albispinus (Monatsschr. Kakteenk. 5: 111. 1895) is sometimes met with.