The Cactaceae : descriptions and illustrations of plants of the cactus family - Britton, Nathaniel Lord, 1859 -1934 (Carnegie Institution of Washington, 1922)

Carnegie Institution of Washington publication - Carnegie Institution of Washington (Carnegie Institution of Washington, 1922)

Flora del Valle de Tehuacán-Cuicatlán (Universidad Nacional Autónoma de México, 1997)

Flora del Valle de Tehuacán-Cuicatlán (Universidad Nacional Autónoma de México, 2012)