Gymnocactus conothelos (Regel & Klein bis) Backeb., Cactaceae 5: 2859. 1961 Gymnocactus conothelos (Regel & Klein bis) Backeb., Cactaceae 5: 2859. 1961is new combination for Echinocactus conothelos Regel & Klein bis, Index Seminum [St. Petersburg (Petropolitanus)] 1860: 48. 1860Taxon for this nameGymnocactus conothelos (Regel & Klein bis) Backeb.