Opuntia strigil Engelm. in Proc. Amer. Acad. Arts 3: 290. 1856 sec. Hunt 2016
- =Opuntia flexispina Griffiths in Bull. Torrey Bot. Club 43: 87. 1916 syn. sec. Guzmán & al. 2003
- =Opuntia engelmannii var. flexispina (Griffiths) Weniger, Cacti Southw. (Austin): 178. 1970 syn. sec. Guzmán & al. 2003
- =Opuntia strigil var. flexispina (Griffiths) L.D. Benson in Cact. Succ. J. (Los Angeles) 46: 79. 1974 syn. sec. Guzmán & al. 2003