Cereus gracilis Mill., Gard. Dict., ed. 8: Cereus no. 8. 1768

is basionym for Harrisia gracilis (Mill.) Britton in Bull. Torrey Bot. Club 35: 563. 1908

is basionym for Echinopsis gracilis (Mill.) Molinari & Mayta in Succulentopi@ 14: 11. 2015

is basionym for Cactus gracilis (Mill.) Weston in Bot. Univ. 1: 33. 1770

Taxon for this name