Melocactus ruestii subsp. oaxacensis (Britton & Rose) Elizondo in Cact. Suc. Mex. 31: 52. 1986 Melocactus ruestii subsp. oaxacensis (Britton & Rose) Elizondo in Cact. Suc. Mex. 31: 52. 1986is new combination for Cactus oaxacensis Britton & Rose, Cactaceae 4: 289. 1923Taxon for this nameMelocactus ruestii subsp. oaxacensis (Britton & Rose) Elizondo