Armatocereus riomajensis Rauh & Backeb., Descr. Cact. Nov. 1: 13. 1957 ["1956"] Armatocereus riomajensis Rauh & Backeb., Descr. Cact. Nov. 1: 13. 1957 ["1956"]Taxon for this nameArmatocereus riomajensis Rauh & Backeb., Descr. Cact. Nov. 1: 13. 1957 ["1956"]