Disocactus biformis (Lindl.) Lindl. in Edwards's Bot. Reg. 31: t. 9. 1845 sec. Hunt & al. 2006
- ≡Cereus biformis Lindl. in Edwards's Bot. Reg. 29: t. 51. 1843 syn. sec. Hunt & al. 2006
- =Epiphyllum biforme (Lindl.) G. Don ex Loudon, Encycl. pl., ed. 3: 1378. 1855 syn. sec. Hunt & al. 2006