Horridocactus kesselringianus var. subaequalis Backeb., Cactaceae 3: 1841. 1959
Horridocactus kesselringianus var. subaequalis, Cactaceae 3: 1841. 1959
is basionym for Neoporteria curvispina f. subaequalis in Cact. Succ. J. Gr. Brit. 28: 56. 1966
Horridocactus kesselringianus var. subaequalis, Cactaceae 3: 1841. 1959
Taxon for this name