Ferocactus townsendianus Britton & Rose, Cactaceae (Britton & Rose) 3: 127. 1922 sec. Hunt 2016
- =Ferocactus peninsulae var. townsendianus (Britton & Rose) N.P. Taylor in Bradleya 2: 28. 1984 syn. sec. Guzmán & al. 2003
- =Ferocactus peninsulae subsp. townsendianus (Britton & Rose) Pilbeam & Bowdery, Ferocactus: 83. 2005 syn. sec. Guzmán & al. 2003