Mammillaria severini Regel & Klein bis, Index Seminum [St. Petersburg (Petropolitanus)] 1860: 46. 1860 Mammillaria severini Regel & Klein bis, Index Seminum [St. Petersburg (Petropolitanus)] 1860: 46. 1860is orthographic variant for Mammillaria severiniiTaxon for this nameMammillaria severini Regel & Klein bis