Ferocactus robustus (Pfeiff.) Britton & Rose Ferocactus robustus (Pfeiff.) Britton & Rose, Cactaceae (Britton & Rose) 3: 135. 1922 sec. Hunt 2016≡Echinocactus robustus Pfeiff., Enum. Diagn. Cact.: 61. 1837 syn. sec. Guzmán & al. 2003