Turbinicarpus saueri subsp. knuthianus (Boed.) A. Lüthy, Cacti CITES Appendix I: 9. 2001 sec. Hunt 2016
- ≡Echinocactus knuthianus Boed. in Monatsschr. Deutsch. Kakteen-Ges. 2: 139. 1930 syn. sec. Guzmán & al. 2003
- =Neolloydia knuthiana (Boed.) F.M. Knuth, Kaktus-ABC: 367. 1936 syn. sec. Guzmán & al. 2003
- =Thelocactus knuthianus (Boed.) Borg, Cacti (Borg): 284. 1937 syn. sec. Guzmán & al. 2003
- =Gymnocactus knuthianus (Boed.) Backeb., Cactaceae (Backeberg) 5: 2858. 1961 syn. sec. Guzmán & al. 2003
- =Turbinicarpus knuthianus (Boed.) V. John & Ríha in Kaktusy (Brno) 19: 22. 1983 syn. sec. Guzmán & al. 2003
- =Pediocactus knuthianus (Boed.) Halda in Acta Mus. Richnov., Sect. Nat., 5: 18. 1998 syn. sec. Guzmán & al. 2003