Euphorbia perennans (Shinners) Warnock & M. C. Johnst. Euphorbia perennans (Shinners) Warnock & M. C. Johnst., Southw. Naturalist 5: 170. 1960 sec. Steinmann 2025≡Chamaesyce perennans Shinners, Field & Lab. 24: 38. 1956 syn. sec. Martínez-Gordillo & al. 2006