Euphorbia lancifolia Schltdl. Euphorbia lancifolia Schltdl. in Linnaea 7: 143. 1832 sec. Martínez-Gordillo & al. 2002=Euphorbia lancifolia var. villicaulis Fernald in Proc. Amer. Acad. Arts 36: 496. 1901 syn. sec. Martínez-Gordillo & al. 2006