Disocactus macdougallii (Alexander) Barthlott in Bradleya 9: 88. 1991 sec. Hunt 2016
- ≡Lobeira macdougallii Alexander in Cact. Succ. J. (Los Angeles) 16: 178. 1944 syn. sec. Guzmán & al. 2003
- =Nopalxochia macdougallii (Alexander) W.T. Marshall in Cact. Succ. J. (Los Angeles) 19: 95. 1947 syn. sec. Guzmán & al. 2003
- =Heliocereus macdougallii (Alexander) Doweld in Sukkulenty 4: 42. 2002 syn. sec. Bauer 2003