Notocactus ottonis var. villa-velhensis Backeb. & Voll in Arch. Jard. Bot. Rio de Janeiro 9: 172. 1950
Notocactus ottonis var. villa-velhensis in Arch. Jard. Bot. Rio de Janeiro 9: 172. 1950
is basionym for Notocactus carambeiensis var. villa-velhensis in Internoto 12(1): 32. 1991
is basionym for Notocactus carambeiensis var. villa-velhensis in Internoto 15(4): 144. 1994