Seticereus icosagonus var. oehmeanus (Backeb.) Backeb., Cactaceae 2: 981. 1959 Seticereus icosagonus var. oehmeanus (Backeb.) Backeb., Cactaceae 2: 981. 1959is new combination for Seticereus oehmeanus Backeb. in Cactaceae (Berlin) 1937(2): 14. 1937Taxon for this nameSeticereus icosagonus var. oehmeanus (Backeb.) Backeb.