Euphorbia humayensis Brandegee Euphorbia humayensis Brandegee in Zoe 5: 208. 1905 sec. Martínez-Gordillo & al. 2002=Eumecanthus humayensis (Brandegee) Millsp., Publ. Field Mus. Nat. Hist. Bot. ser. 2(11). 414. 1916 syn. sec. Martínez-Gordillo & al. 2006