Tephrocactus sphaericus var. unguispinus (Backeb.) Backeb., Cactaceae 1: 297. 1958 Tephrocactus sphaericus var. unguispinus (Backeb.) Backeb., Cactaceae 1: 297. 1958Taxon for this nameTephrocactus sphaericus var. unguispinus (Backeb.) Backeb.
