homotypic synonyms:
Ferocactus townsendianus variety santa-maria (Britton & Rose) G.E.Linds.;
protologue: Cact. 3: 127 (1922)
2 432151 Ferocactus townsendianus Britton & Rose
N.L. Britton, J.N. Rose, Cact., vol. 3 : t. 12 (1922) [M.E. Eaton]
Ferocactus townsendianus variety santa-maria (Britton & Rose) G.E.Linds.;
protologue: Cact. 3: 127 (1922)
2 432151 Ferocactus townsendianus Britton & RoseN.L. Britton, J.N. Rose, Cact., vol. 3 : t. 12 (1922) [M.E. Eaton]