Parodia horstii
Parodia horstii in Bradleya 5: 93. 1987 sec. Zappi & Taylor 20201 wfo-0001256028
- ≡Notocactus horstii in Succulenta (Netherlands) 45: 3. 1966 syn. sec. Anceschi & Magli 20182 wfo-0001256016
- ≡Peronocactus horstii in Sukkulenty 2(2): 21. 1999 syn. sec. Anceschi & Magli 20182 wfo-0000397838
- =Notocactus purpureus in Succulenta (Netherlands) 49: 109. 1970 syn. sec. Anceschi & Magli 20183 wfo-0001262623
- ≡Notocactus horstii f. purpureus in Internoto 14: 64. 1993 syn. sec. ??? wfo-0001432905
- =Notocactus horstii var. purpureiflorus, Kakteen Südamerika 1: 184. 1979 syn. sec. Kew 20194 wfo-0001262622
- ≡Notocactus horstii f. purpureiflorus in Internoto 14(2): 64. 1993 syn. sec. Kew 20194 wfo-0001262621
- =Wigginsia nothohorstii in Sukkulenty 3: 62. 2000 syn. sec. Kew 20195 wfo-0000427611
- =Notocactus katharinae in Succulenta (Netherlands) 81: 200. 2002 syn. sec. Anceschi & Magli 20186 wfo-0000378503
- =Notocactus horstii f. muglianus in Kakteen And. Sukk. 70(8): 242. 2019 syn. sec. ??? wfo-0001302986
- –Notocactus horstii f. muglianus in Internoto 14: 64. 1993, nom. inval. syn. sec. Kew 20197 wfo-0001432904