Euphorbia peplidion Engelm. Euphorbia peplidion Engelm., Rep. U.S. Mex. Bound., Bot. 2(1). 1859 sec. Martínez-Gordillo & al. 2002=Tithymalus peplidion (Engelm.) Small, Fl. S.E. U.S. 1903 syn. sec. Martínez-Gordillo & al. 2006