Opuntia nicholii L.D.Benson, Cacti Ariz., ed. 2: 48–50. 1950
Opuntia nicholii, Cacti Ariz., ed. 2: 48–50. 1950
is basionym for Opuntia polyacantha var. nicholii in Cact. Succ. J. (Los Angeles) 70(4): 188. 1998
is basionym for Opuntia hystricina var. nicholii, Cactaceae 1: 610. 1958