Pterocactus australis (F.A.C.Weber) Backeb. in Desert Pl. Life 22: 17. 1950 sec. Hunt 2016
- ≡Opuntia australis F.A.C.Weber in Bois, Dict. Hort.: 896. 1898 syn. sec. Hunt 2016
- =Pterocactus australis var. arnoldianus Backeb. in Cact. Succ. J. (Los Angeles) 23: 14. 1951 syn. sec. Kew WCVP (2019)