Euphorbia xbacensis Millsp. in Publ. Field Columbian Mus., Bot. Ser. 1: 374. 1898 sec. Martínez-Gordillo & al. 2002
- =Eumecanthus xbacensis (Millsp.) Millsp., Publ. Field Mus. Nat. Hist. Bot. ser. 2(11). 413. 1916 syn. sec. Martínez-Gordillo & al. 2006