Peniocereus greggii (Engelm.) Britton & Rose Peniocereus greggii (Engelm.) Britton & Rose in Contr. U.S. Natl. Herb. 12: 428. 1909 sec. Hunt 2016≡Cereus greggii Engelm., Memoir Tour N. Mexico [Wislizenus]: 102. 1848 syn. sec. Guzmán & al. 2003