Horridocactus horridus (Colla) Backeb. in Kakteenkunde 1940: 51. 1940 Horridocactus horridus (Colla) Backeb. in Kakteenkunde 1940: 51. 1940Taxon for this nameHorridocactus horridus (Colla) Backeb. in Kakteenkunde 1940: 51. 1940
