Cereus meyenii (Britton & Rose) Werderm. in Backeberg, Neue Kakteen: 79. 1931 Cereus meyenii (Britton & Rose) Werderm. in Backeberg, Neue Kakteen: 79. 1931is new combination for Erdisia meyenii Britton & Rose, Cactaceae 2: 105. 1920Taxon for this nameCereus meyenii (Britton & Rose) Werderm.