Matucana herzogiana var. perplexa Backeb. in Cact. Succ. J. (Los Angeles) 2(4): 70–71. 1956
Matucana herzogiana var. perplexa in Cact. Succ. J. (Los Angeles) 2(4): 70–71. 1956
is basionym for Borzicactus haynei var. perplexa in Natl. Cact. Succ. J. 25: 111. 1970