Opuntia phaeacantha Engelm. in Mem. Amer. Acad. Arts, n.s., 4: 52. 1849 sec. Hunt 2016
- =Opuntia angustata Engelm. & Bigelow in Proc. Amer. Acad. Arts 3: 292. 1856 syn. sec. Guzmán & al. 2003
- =Opuntia dulcis Engelm. in Proc. Amer. Acad. Arts 3: 291. 1856 syn. sec. Guzmán & al. 2003
- =Opuntia mojavensis Engelm. & Bigelow in Proc. Amer. Acad. Arts 3: 293. 1856 syn. sec. Guzmán & al. 2003
- =Opuntia phaeacantha var. brunnea Engelm. in Proc. Amer. Acad. Arts 3: 37. 1856 syn. sec. Guzmán & al. 2003
- =Opuntia phaeacantha var. major Engelm. in Proc. Amer. Acad. Arts 3: 37. 1856 syn. sec. Guzmán & al. 2003
- =Opuntia phaeacantha var. nigricans Engelm. in Proc. Amer. Acad. Arts 3: 37. 1856 syn. sec. Guzmán & al. 2003
- =Opuntia procumbens Engelm. & Bigelow in Proc. Amer. Acad. Arts 3: 36. 1856 syn. sec. Guzmán & al. 2003
- =Opuntia laevis J.M. Coult. in Contr. U.S. Natl. Herb. 3: 419. 1896 syn. sec. Guzmán & al. 2003
- =Opuntia discata Griffiths in Rep. (Annual) Missouri Bot. Gard. 19: 266. 1908 syn. sec. Guzmán & al. 2003
- =Opuntia chihuahuensis Rose in Contr. U.S. Natl. Herb. 12: 291. 1909 syn. sec. Guzmán & al. 2003
- =Opuntia megacarpa Griffiths in Rep. (Annual) Missouri Bot. Gard. 20: 91. 1909 syn. sec. Guzmán & al. 2003
- =Opuntia zuniensis Griffiths in Bull. Torrey Bot. Club 43: 86. 1916 syn. sec. Guzmán & al. 2003
- =Opuntia spinosibacca M.S. Anthony in Amer. Midl. Naturalist 55: 246. 1956 syn. sec. Guzmán & al. 2003
- =Opuntia phaeacantha var. discata (Griffiths) L.D. Benson & Walk. in Ann. Missouri Bot. Gard. 52: 265. 1965 syn. sec. Guzmán & al. 2003
- =Opuntia phaeacantha var. laevis (J.M. Coult.) L.D. Benson, Cacti Ariz., ed. 3: 21. 1969 syn. sec. Guzmán & al. 2003
- =Opuntia phaeacantha var. spinosibacca (M.S. Anthony) L.D. Benson in Cact. Succ. J. (Los Angeles) 41: 125. 1969 syn. sec. Guzmán & al. 2003
- =Opuntia phaeacantha var. chihuahuensis (Rose) Bravo in Cact. Suc. Mex. 19: 47. 1974 syn. sec. Guzmán & al. 2003