Euphorbia cyathophora Murray in Commentat. Soc. Regiae Sci. Gott. Recent. 7: 81, t. 1. 1786 sec. Martínez-Gordillo & al. 2002
- =Tithymalus cyatophorus (Murray) Moench, Methodus: 667. 1794 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia graminifolia Michx., Fl. Bor.-Amer. 2: 210. 1803 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia havanensis Willd. ex Schltdl. & Cham. in Linnaea 5: 83. 1830 syn. sec. Martínez-Gordillo & al. 2006
- =Cyathophora ciliata Raf., Flora Telluriana. 4: 117. 1838 syn. sec. Martínez-Gordillo & al. 2006
- =Cyathophora picta Raf., Flora Telluriana. 4: 117. 1838 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia angustifolia Lockh. ex G. Don, Hortus Britannicus, Sweet's: 598. 1839 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia lockhartii Steud., Nomencl. Bot. (ed. 2). 1841 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia barbellata Engelm. in Rep. U.S. Mex. Bound., Bot. 2(1): 190. 1859 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia heterophylla var. graminifolia Engelm. in Rep. U.S. Mex. Bound., Bot. 2(1): 190. 1859 syn. sec. Martínez-Gordillo & al. 2006
- =Poinsettia cyathophora (Murray) Klotzsch & Garcke in Abh. Königl. Akad. Wiss. Berlin 1859: 253. 1860 syn. sec. Martínez-Gordillo & al. 2006
- =Poinsettia edwardsii Klotzsch & Garcke in Abh. Königl. Akad. Wiss. Berlin 1859: 104. 1860 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia heterophylla var. cyathophora (Murray) Boiss., Prodr. (DC.). 15(2): 72. 1862 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia heterophylla var. genuina Boiss., Prodr. (DC.). 15(2): 72. 1862 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia heterophylla var. brasiliensis Müll. Arg., Flora Brasiliensis. 11(2): 695. 1874 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia heterophylla var. barbellata (Engelm.) Holz. in Contr. U.S. Natl. Herb. 1: 216. 1892 syn. sec. Martínez-Gordillo & al. 2006
- =Euphorbia heterophylla f. cyathophora (Murray) Voss, Vilm. Blumengärtn., ed. 3. 1: 898. 1895 syn. sec. Martínez-Gordillo & al. 2006
- =Poinsettia barbellata Small, Fl. S. E. U. S.: 1334. 1903 syn. sec. Martínez-Gordillo & al. 2006
- =Poinsettia havanensis (Willd. ex Schltdl. & Cham.) Small, Fl. S. E. U. S.: 1334. 1903 syn. sec. Martínez-Gordillo & al. 2006
- =Poinsettia graminifolia (Michx.) Millsp. in Publ. Field Columbian Mus., Bot. Ser. 2(7): 304. 1909 syn. sec. Martínez-Gordillo & al. 2006