Selenicereus macdonaldiae var. grusonianus (Weing.) Backeb., Cactaceae 2: 788. 1959 Selenicereus macdonaldiae var. grusonianus (Weing.) Backeb., Cactaceae 2: 788. 1959is new combination for Cereus grusonianus Weing. in Monatsschr. Kakteenk. 15: 54. 1905Taxon for this nameSelenicereus macdonaldiae var. grusonianus (Weing.) Backeb.