Cactus maxonii Rose in Smithsonian Misc. Collect. 50: 63. 1907
Cactus maxonii in Smithsonian Misc. Collect. 50: 63. 1907
is basionym for Melocactus maxonii in Monatsschr. Kakteenk. 18: 93. 1908
is basionym for Melocactus ruestii subsp. maxonii in Cact. Suc. Mex. 31: 53. 1986