Cereus insularis Hemsl. in Rep. Challenger, Bot. 1(2): 16. 1884 sec. Zappi & Taylor 2020
- ≡Monvillea insularis (Hemsl.) Britton & Rose, Cactaceae 2: 23, f. 21. 1920 syn. sec. ???
- =? Cereus ridleii Andrade-Lima ex Backeb., Cactaceae 4: 2352. 1960 syn. sec. Hunt 2016