Pascopyrum smithii (Rydb.) Barkworth & D.R. Dewey in Amer. J. Bot. 72(5): 772. 1985 sec. Dávila & al. 2018
- ≡Agropyron smithii Rydb. in Mem. New York Bot. Gard. 1: 64. 1900 syn. sec. Dávila & al. 2006
- =Agropyron glaucum var. occidentale Scribn. in Trans. Kansas Acad. Sci. 9: 119. 1885 syn. sec. Dávila & al. 2006
- =Agropyron spicatum var. molle Scribn. & J.G. Sm. in Bull. Div. Agrostol. U.S.D.A. 4: 33. 1897 syn. sec. Dávila & al. 2006
- =Agropyron spicatum var. palmeri Scribn. & J.G. Sm. in Bull. Div. Agrostol. U.S.D.A. 4: 33. 1897 syn. sec. Dávila & al. 2006
- =Agropyron molle (Scribn. & J.G. Sm.) Rydb. in Mem. New York Bot. Gard. 1: 65. 1900 syn. sec. Dávila & al. 2006
- =Agropyron occidentale (Scribn.) Scribn. in Circ. Div. Agrostol. U.S.D.A. 27: 9. 1900 syn. sec. Dávila & al. 2006
- =Agropyron occidentale var. molle (Scribn. & J.G. Sm.) Scribn. in Circ. Div. Agrostol. U.S.D.A. 27: 9. 1900 syn. sec. Dávila & al. 2006
- =Agropyron occidentale (Scribn.) Scribn. var. occidentale in Circ. Div. Agrostol. U.S.D.A. 27: 9. 1900 syn. sec. Dávila & al. 2006
- =Agropyron occidentale var. palmeri (Scribn. & J.G. Sm.) Scribn. in Circ. Div. Agrostol. U.S.D.A. 27: 9. 1900 syn. sec. Dávila & al. 2006
- =Agropyron smithii var. palmeri (Scribn. & J.G. Sm.) A. Heller, Cat. N. Amer. Pl. (ed. 2): 3. 1900 syn. sec. Dávila & al. 2006
- =Agropyron smithii Rydb. var. smithii in Mem. New York Bot. Gard. 1: 64. 1900 syn. sec. Dávila & al. 2006
- =Agropyron palmeri (Scribn. & J.G. Sm.) Rydb. in Bull. Colorado State Univ. Exp. Sta. 100: 55. 1906 syn. sec. Dávila & al. 2006
- =Agropyron smithii var. molle (Scribn. & J.G. Sm.) M.E. Jones in Contr. W. Bot. 14: 18. 1912 syn. sec. Dávila & al. 2006
- =Zeia mollis (Scribn. & J.G. Sm.) Lunell in Amer. Midl. Naturalist 4: 226. 1915 syn. sec. Dávila & al. 2006
- =Zeia occidentalis (Scribn.) Lunell in Amer. Midl. Naturalist 4: 226. 1915 syn. sec. Dávila & al. 2006
- =Zeia smithii (Rydb.) Lunell in Amer. Midl. Naturalist 4: 227. 1915 syn. sec. Dávila & al. 2006
- =Agropyron spicatum var. viride Farw. in Rep. (Annual) Michigan Acad. Sci. 21: 356. 1920 syn. sec. Dávila & al. 2006
- =Elytrigia smithii (Rydb.) Nevski in Trudy Bot. Inst. Akad. Nauk S.S.S.R., Ser. 1, Fl. Sist. Vyssh. Rast. 1: 25. 1933 syn. sec. Dávila & al. 2006
- =Elymus smithii (Rydb.) Gould in Madroño 9(4): 127. 1947 syn. sec. Dávila & al. 2006
- =Agropyron smithii var. typica Waterf. in Rhodora 51(602): 21. 1949 syn. sec. Dávila & al. 2006
- =Agropyron smithii f. molle (Scribn. & J.G. Sm.) J.M. Gillett in Canad. J. Bot. 38: 750. 1960 syn. sec. Dávila & al. 2006
- =Pascopyrum smithii (Rydb.) Á. Löve in Taxon 29(1): 168. 1980 syn. sec. Dávila & al. 2006
- =Elytrigia smithii var. molle (Scribn. & J.G. Sm.) Beetle in Phytologia 55(3): 211. 1984 syn. sec. Dávila & al. 2006