Echinocereus bristolii W.T. Marshall Echinocereus bristolii W.T. Marshall in Cact. Succ. J. (Los Angeles) 9: 160. 1938 sec. Hunt 2016=Echinocereus pectinatus var. bristolii (W.T. Marshall) W.T. Marshall in Saguaroland Bull. 10: 81. 1956 syn. sec. Guzmán & al. 2003