Echinocereus longisetus (Engelm.) Lem. Echinocereus longisetus (Engelm.) Lem., Cactées: 57. 1868 sec. Guzmán & al. 2003≡Cereus longisetus Engelm. in Proc. Amer. Acad. Arts 3: 280. 1856 syn. sec. Guzmán & al. 2003