Echinocereus engelmannii var. howei L.D.Benson in Cact. Succ. J. (Los Angeles) 46: 80. 1974 Echinocereus engelmannii var. howei L.D.Benson in Cact. Succ. J. (Los Angeles) 46: 80. 1974Taxon for this nameEchinocereus engelmannii var. howei L.D.Benson