Euphorbia cornastra (Dressler) Radcl.-Sm. Euphorbia cornastra (Dressler) Radcl.-Sm. in Kew Bull. 32: 482. 1978 sec. Martínez-Gordillo & al. 2002≡Poinsettia cornastra Dressler in Bol. Soc. Bot. Méx. 35: 17. 1975 syn. sec. Martínez-Gordillo & al. 2006