Pilocereus giganteus (Engelm.) Rümpler, Handb. Cacteenk., ed. 2: 662. 1885 Pilocereus giganteus (Engelm.) Rümpler, Handb. Cacteenk., ed. 2: 662. 1885is new combination for Cereus giganteus Engelm. in Amer. J. Sci. Arts, ser. 2, 14: 335-337. 1852This name is not assigned to any taxon.