Opuntia flexospina Griffiths in Bull. Torrey Bot. Club 43: 87. 1916
Opuntia flexospina in Bull. Torrey Bot. Club 43: 87. 1916
is basionym for Opuntia engelmannii var. flexospina in Madroño 35: 348. 1989 ["1988"]
is basionym for Opuntia strigii var. flexospina in Cact. Succ. J. (Los Angeles) 46: 79. 1974