Echinocactus macdowellii Rebut ex Quehl in Monatsschr. Kakteenk. 4: 133. 1894
Echinocactus macdowellii in Monatsschr. Kakteenk. 4: 133. 1894
is basionym for Thelocactus macdowellii in Cact. J. (London) 9: 28. 1947
is basionym for Thelocactus macdowellii in Cact. Suc. Mex. 14: 4. 1969
is basionym for Thelocactus conothelos var. macdowellii in Cact. Succ. J. (Los Angeles) 49: 220. 1977
is basionym for Echinomastus macdowellii, Cactaceae 3: 151. 1922
is basionym for Neolloydia mcdowellii in Baileya 19: 166. 1975
is basionym for Neolloydia macdowellii in Baileya 19: 166. 1975