Ferocactus santa-maria Britton & Rose, Cactaceae (Britton & Rose) 3: 131. 1922 sec. Hunt 2016
- =Ferocactus townsendianus var. santa-maria (Britton & Rose) G.E. Linds. in Cact. Succ. J. (Los Angeles) 27: 170. 1955 syn. sec. Hunt & al. 2006
- =Ferocactus peninsulae var. santa-maria (Britton & Rose) N.P. Taylor in Bradleya 2: 30. 1984 syn. sec. Hunt & al. 2006
- =Ferocactus peninsulae subsp. santa-maria (Britton & Rose) Pilbeam & Bowdery, Ferocactus: 82. 2005 syn. sec. Hunt & al. 2006