Synonyms: Notocactus acutus; Notocactus campestrensis; Notocactus glaucinus; Notocactus glaucinus var. depressus; Notocactus glaucinus var. incomptus; Notocactus glucinus; Notocactus incomptus; Notocactus miniatispinus; Notocactus minusculus; Notocactus ottonis schuldtii; Notocactus ottonis var. minusculus; Notocactus oxycostatus (homotypic); Notocactus oxycostatus f. acutus; Notocactus oxycostatus f. miniatispinus; Notocactus oxycostatus f. securituberculatus; Notocactus oxycostatus var. occidentalis; Notocactus oxycostatus var. schuldtii; Notocactus securituberculatus; Notocactus securituberculatus var. miniatispinus; Parodia glaucina; Parodia nothominuscula; Parodia nothominuscula gravior; Peronocactus minusculus; Peronocactus oxycostatus (homotypic)