Cereus mortensenii (Croizat) D.R.Hunt & N.P.Taylor in Bradleya 9: 85. 1991 sec. Hunt 2016
- ≡Pilocereus mortensenii Croizat in Noved. Ci., Ser. Bot. no. 1: 3. 1960 syn. sec. Hunt 2016
- ≡Pilosocereus mortensenii (Croizat) Backeb., Cactaceae 4: 2450. 1960 syn. sec. Hunt 2016
- ≡Subpilocereus mortensenii (Croizat) Trujillo & Marisela Ponce in Ernstia 47: 28. 1988 syn. sec. Hunt 2016
- ≡Praepilosocereus mortensenii (Croizat) Guiggi in Cactology 2: 19. 2010 syn. sec. ???
- =Pilosocereus gruberi Schatzl & H.Till in Kakteen And. Sukk. 33: 9. 1982 syn. sec. Hunt 2016