Pygmaeocereus rowleyanus Backeb., Cactaceae 6: 3718. 1962 Pygmaeocereus rowleyanus Backeb., Cactaceae 6: 3718. 1962is basionym for Arthrocereus rowleyanus (Backeb.) Buxb. in Kakteen And. Sukk. 20: 97. 1969Taxon for this namePygmaeocereus rowleyanus Backeb.