Euphorbia arizonica Engelm., Rep. U.S. Mex. Bound., Bot. 2(1). 1858 sec. Martínez-Gordillo & al. 2002
- =Euphorbia versicolor Greene, Bot. Gaz. 6(3). 1881 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia portulana S. Watson, Proc. Amer. Acad. Arts 24. 1889 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia purisimana Millsp., Proc. Calif. Acad. Sci. 2. 1889 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia collina Brandegee, Univ. Calif. Publ. Bot. 4(11). 1911 syn. sec. Martínez-Gordillo & al. 2006
- =Chamaesyce arizonica (Engelm.) Arthur, Torreya 11. 1912 syn. sec. Martínez-Gordillo & al. 2006
- =Chamaesyce portulana (S. Watson) Millsp., Publ. Field Mus. Nat. Hist. Bot. Ser. 2(11). 1916 syn. sec. Martínez-Gordillo & al. 2006
- =Chamaesyce purisimana (Millsp.) Millsp., Publ. Field Mus. Nat. Hist. Bot. Ser. 2(11). 1916 syn. sec. Martínez-Gordillo & al. 2006
- =Chamaesyce versicolor (Greene) Norton, Contr. U.S. Natl. Herb. 25. 1925 syn. sec. Martínez-Gordillo & al. 2006