Cylindropuntia thurberi (Engelm.) F.M. Knuth subsp. thurberi Cylindropuntia thurberi (Engelm.) F.M. Knuth subsp. thurberi, Kaktus-ABC: 124. 1936 sec. Guzmán & al. 2003=Grusonia thurberi (Engelm.) G.D. Rowley in Tephrocactus Study Group 12: 45. 2006 syn. sec. Rowley 2006