Euphorbia nocens (L. C. Wheeler) V. W. Steinm. Euphorbia nocens (L. C. Wheeler) V. W. Steinm., Acta Bot. Mex. 64: 39. 2003 sec. Steinmann 2025≡Euphorbia hirta var. nocens L.C. Wheeler, Contr. Gray Herb. 127. 1939 syn. sec. Martínez-Gordillo & al. 2006