Euphorbia acuta Engelm. Euphorbia acuta Engelm., Rep. U.S. Mex. Bound., Bot. 2(1): 189. 1859 sec. Steinmann 2025≡Chamaesyce acuta (Engelm.) Millsp., Publ. Field Mus. Nat. Hist. Bot. Ser. 2(11): 407-408. 1916 syn. sec. Martínez-Gordillo & al. 2006=Euphorbia acuta var. stenophylla Boiss., A.P.de Candolle, Prodr. 15(2): 18. 1862 syn. sec. Martínez-Gordillo & al. 2006=Euphorbia georgei Oudejans, Phytologia 67: 45. 1989 syn. sec. Martínez-Gordillo & al. 2006