Echinocereus engelmannii var. armatus L.D.Benson in Cact. Succ. J. (Los Angeles) 41: 33. 1969 Echinocereus engelmannii var. armatus L.D.Benson in Cact. Succ. J. (Los Angeles) 41: 33. 1969Taxon for this nameEchinocereus engelmannii var. armatus L.D.Benson