Setiechinopsis mirabilis var. gracilior Backeb., Descr. Cact. Nov. 3: 14. 1963 Setiechinopsis mirabilis var. gracilior Backeb., Descr. Cact. Nov. 3: 14. 1963is basionym for Arthrocereus mirabilis var. gracilior (Backeb.) Donald in Ashingtonia 2(3): 3. 1975Taxon for this nameSetiechinopsis mirabilis var. gracilior Backeb.