Opuntia azurea Opuntia azurea Rose in Contr. U.S. Natl. Herb. 12(7): 291, t. 24, f. 33. 1909 sec. Powell & Weedin 20041≡Opuntia macrocentra subsp. azurea (Rose) Guiggi in Cactology 3 (Suppl. II): 3. 2012 syn. sec. Powell & Weedin 200411. Powell, M.J. & Weedin, J.F. 2004: Cacti of the Trans-Pecos and adjacent areas. – Lubbock, Texas, USA: Texas Tech University PressContent
