Euphorbia feddemae McVaugh Euphorbia feddemae McVaugh, Brittonia 13(24). 1961 sec. Martínez-Gordillo & al. 2002=Chamaesyce feddemae (McVaugh) McVaugh, Contr. Univ. Michigan Herb. 19. 1993 syn. sec. Martínez-Gordillo & al. 2006