Escobaria duncanii (Hester) Backeb., Cactaceae (Backeberg) 5: 2966. 1961 sec. Hunt 2016
- ≡Escobesseya duncanii Hester in Desert Pl. Life 13: 192. 1945 syn. sec. Guzmán & al. 2003
- =Coryphantha duncanii (Hester) L.D. Benson in Cact. Succ. J. (Los Angeles) 41: 189. 1969 syn. sec. Guzmán & al. 2003
- =Escobaria dasyacantha var. duncanii (Hester) N.P. Taylor in Kakteen And. Sukk. 34: 157. 1983 syn. sec. Guzmán & al. 2003