Harrisia gracilis var. simpsonii (Small ex Britton & Rose) D.B.Ward in Novon 14: 367. 2004 Harrisia gracilis var. simpsonii (Small ex Britton & Rose) D.B.Ward in Novon 14: 367. 2004is new combination for Harrisia simpsonii Small ex Britton & Rose, Cactaceae 2: 152. 1920Taxon for this nameHarrisia gracilis var. simpsonii (Small ex Britton & Rose) D.B.Ward