Euphorbia perennans (Shinners) Warnock & M.C. Johnst. Euphorbia perennans (Shinners) Warnock & M.C. Johnst., Southw. Naturalist 5. 1960 sec. Martínez-Gordillo & al. 2002≡Chamaesyce perennans Shinners, Field & Lab. 24. 1956 syn. sec. Martínez-Gordillo & al. 2006