Cereus gracilis var. simpsonii (Small ex Britton & Rose) L.D.Benson in Cact. Succ. J. (Los Angeles) 41: 126. 1969
Cereus gracilis var. simpsonii in Cact. Succ. J. (Los Angeles) 41: 126. 1969
is new combination for Harrisia simpsonii, Cactaceae 2: 152. 1920