Synonyms: Cactus acicularis; Cactus atratus; Cactus canescens (homotypic); Cactus capillaris; Cactus centrispinus; Cactus chrysacanthus; Cactus crassispinus; Cactus fulvispinus; Cactus laniferus; Cactus nigricans; Cactus phaeacanthus; Cactus pulcher; Cactus pyrrhochracanthus; Cactus rhodanthus (homotypic); Cactus rhodanthus var. sulphureospinus; Cactus ruficeps; Cactus rutilus; Cactus stenocephalus; Cactus stueberi; Cactus tentaculatus; Mammillaria acicularis; Mammillaria andreae; Mammillaria atrata; Mammillaria aurata; Mammillaria aurea; Mammillaria centrispina; Mammillaria chrysacantha; Mammillaria crassispina; Mammillaria crassispina var. gracilior; Mammillaria diacentra; Mammillaria erinacea; Mammillaria eugenia; Mammillaria flaviceps (homotypic); Mammillaria floccigera (homotypic); Mammillaria fulvispina; Mammillaria fulvispina var. pyrrhocentra; Mammillaria fulvispina var. rubescens; Mammillaria fuscata var. russea; Mammillaria fuscata var. sulphurea; Mammillaria hybrida; Mammillaria imbricata; Mammillaria inuncta; Mammillaria karwinskiana var. centrispina; Mammillaria lanifera; Mammillaria neglecta; Mammillaria nigricans; Mammillaria odieriana var. aurea; Mammillaria odieriana var. rigidior; Mammillaria olivacea; Mammillaria pfeifferi (homotypic); Mammillaria pfeifferi var. altissima; Mammillaria pfeifferi var. dichotoma; Mammillaria pfeifferi var. flaviceps; Mammillaria pfeifferi var. fulvispina; Mammillaria pfeifferi var. variabilis; Mammillaria phaeacantha; Mammillaria pulchra; Mammillaria punctata (homotypic); Mammillaria pyramidalis; Mammillaria pyrrhocentra; Mammillaria pyrrhochracantha; Mammillaria radula (homotypic); Mammillaria rhodantha f. andreae; Mammillaria rhodantha f. callaena; Mammillaria rhodantha f. centrispina; Mammillaria rhodantha f. crassispina; Mammillaria rhodantha f. fulvispina; Mammillaria rhodantha f. neglecta; Mammillaria rhodantha f. pfeifferi; Mammillaria rhodantha f. pyramidalis; Mammillaria rhodantha f. ruberrima; Mammillaria rhodantha f. ruficeps; Mammillaria rhodantha f. stenocephala; Mammillaria rhodantha f. sulphurea; Mammillaria rhodantha f. tentaculata; Mammillaria rhodantha var. andreae (homotypic); Mammillaria rhodantha var. callaena; Mammillaria rhodantha var. centrispina (homotypic); Mammillaria rhodantha var. chrysacantha; Mammillaria rhodantha var. crassispina; Mammillaria rhodantha var. fulvispina; Mammillaria rhodantha var. major (homotypic); Mammillaria rhodantha var. neglecta; Mammillaria rhodantha var. pfeifferi; Mammillaria rhodantha var. prolifera; Mammillaria rhodantha var. pyramidalis; Mammillaria rhodantha var. rubens; Mammillaria rhodantha var. ruberrima; Mammillaria rhodantha var. rubra; Mammillaria rhodantha var. ruficeps; Mammillaria rhodantha var. stenocephala; Mammillaria rhodantha var. sulphurea; Mammillaria rhodantha var. wendlandii; Mammillaria robusta (homotypic); Mammillaria ruficeps; Mammillaria russea; Mammillaria rutila (homotypic); Mammillaria rutila var. octospina; Mammillaria rutila var. pallidior; Mammillaria stenocephala; Mammillaria stueberi; Mammillaria sulphurea; Mammillaria tentaculata; Mammillaria tentaculata var. conothele (homotypic); Mammillaria tentaculata var. picta; Neomammillaria phaeacantha