Euphorbia potosina Fernald Euphorbia potosina Fernald, Proc. Amer. Acad. Arts 36. 1901 sec. Martínez-Gordillo & al. 2002=Chamaesyce potosina (Fernald) Arthur, Torreya 12. 1911 syn. sec. Martínez-Gordillo & al. 2006