Neoporteria curvispina var. echinus (F.Ritter) Donald & G.D.Rowley in Cact. Succ. J. Gr. Brit. 28: 55. 1966
Neoporteria curvispina var. echinus in Cact. Succ. J. Gr. Brit. 28: 55. 1966
is new combination for Pyrrhocactus echinus in Taxon 12: 33. 1963