Opuntia azurea var. diplopurpurea Opuntia azurea var. diplopurpurea A.M.Powell & Weedin, Cacti Trans-Pecos: 130. 2004 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