Ritterocereus montanus (Britton & Rose) Backeb. in Cact. Succ. J. (Los Angeles) 23(4): 121. 1951 Ritterocereus montanus (Britton & Rose) Backeb. in Cact. Succ. J. (Los Angeles) 23(4): 121. 1951is new combination for Lemaireocereus montanus Britton & Rose, Cactaceae 2: 97. 1920Taxon for this nameRitterocereus montanus (Britton & Rose) Backeb.