Mammillaria johnstonii (Britton & Rose) Orcutt in Cactography 7. 1926 sec. Hunt 2016
- ≡Neomammillaria johnstonii Britton & Rose, Cactaceae 4: 80–81, f. 72b. 1923 syn. sec. Hunt 2016
- =Mammillaria johnstonii var. guaymensis R.T.Craig, Mammill. Handb.: 99. 1945 syn. sec. Kew WCVP (2019)
- =Mammillaria johnstonii var. sancarlensis R.T.Craig, Mammill. Handb.: 99. 1945 syn. sec. Kew WCVP (2019)
- –Neomammillaria johnstonii var. sancarlensis (R.T.Craig) Y.Itô, Cactaceae: 620. 1981, nom. inval., syn. sec. Kew WCVP (2019)
- –Mammillaria johnstonii var. typica R.T.Craig, Mammill. Handb.: 99. 1945, nom. inval., syn. sec. Kew WCVP (2019)
