Ferocactus schwarzii G.E. Linds. Ferocactus schwarzii G.E. Linds. in Cact. Succ. J. (Los Angeles) 27: 70. 1955 sec. Hunt 2016=Parrycactus schwarzii (G.E. Linds.) Doweld in Novosti Syst. Vyssh. Rast. 32: 118. 2000 syn. sec. Guzmán & al. 2003