Elymus elymoides (Raf.) Swezey in Doane Coll. Nat. Hist. Stud. 1: 155. 1891 sec. Dávila & al. 2018
- ≡Sitanion elymoides Raf. in J. Phys. Chim. Hist. Nat. Arts 89: 103. 1819 syn. sec. Dávila & al. 2006
- =Aegilops hystrix Nutt., Gen. N. Amer. Pl. 1: 86. 1818 syn. sec. Dávila & al. 2006
- =Elymus sitanion Schult., Mant. 2: 426. 1824 syn. sec. Dávila & al. 2006
- =Polyantherix hystrix (Nutt.) Nees in Ann. Nat. Hist. 1: 284. 1838 syn. sec. Dávila & al. 2006
- =Chretomeris trichoides Nutt. ex J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 15. 1899 syn. sec. Dávila & al. 2006
- =Sitanion brevifolium J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 17, t. 3. 1899 syn. sec. Dávila & al. 2006
- =Sitanion caespitosum J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 16. 1899 syn. sec. Dávila & al. 2006
- =Sitanion cinereum J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 14. 1899 syn. sec. Dávila & al. 2006
- =Sitanion glabrum J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 14. 1899 syn. sec. Dávila & al. 2006
- =Sitanion hystrix (Nutt.) J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 15, t. 2. 1899 syn. sec. Dávila & al. 2006
- =Sitanion insulare J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 14. 1899 syn. sec. Dávila & al. 2006
- =Sitanion latifolium Piper in Erythea 7: 99. 1899 syn. sec. Dávila & al. 2006
- =Sitanion minus J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 12. 1899 syn. sec. Dávila & al. 2006
- =Sitanion molle J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 17. 1899 syn. sec. Dávila & al. 2006
- =Sitanion montanum J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 16. 1899 syn. sec. Dávila & al. 2006
- =Sitanion pubiflorum J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 19. 1899 syn. sec. Dávila & al. 2006
- =Sitanion rigidum J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 13. 1899 syn. sec. Dávila & al. 2006
- =Sitanion strigosum J.G. Sm. in Bull. Div. Agrostol., U.S.D.A. 18: 17. 1899 syn. sec. Dávila & al. 2006
- =Elymus glaber (J.G. Sm.) Burtt Davy in Univ. Calif. Publ. Bot. 1: 57. 1902 syn. sec. Dávila & al. 2006
- =Elymus pubiflorus (J.G. Sm.) Burtt Davy in Univ. Calif. Publ. Bot. 1: 58. 1902 syn. sec. Dávila & al. 2006
- =Sitanion marginatum Scribn. & Merr. in Bull. Torrey Bot. Club 29(7): 469-470. 1902 syn. sec. Dávila & al. 2006
- =Sitanion albescens Elmer in Bot. Gaz. 36: 57. 1903 syn. sec. Dávila & al. 2006
- =Sitanion basalticola Piper in Bull. Torrey Bot. Club 30: 234. 1903 syn. sec. Dávila & al. 2006
- =Sitanion ciliatum Elmer in Bot. Gaz. 36: 58. 1903 syn. sec. Dávila & al. 2006
- =Sitanion velutinum Piper in Bull. Torrey Bot. Club 30: 233. 1903 syn. sec. Dávila & al. 2006
- =Hordeum elymoides (Raf.) Schenck in Bot. Jahrb. Syst. 40: 109. 1907 syn. sec. Dávila & al. 2006
- =Elymus hystrix (Nutt.) M.E. Jones in Contr. W. Bot. 14: 20. 1912 syn. sec. Dávila & al. 2006
- =Elymus insularis (J.G. Sm.) M.E. Jones in Contr. W. Bot. 14: 20. 1912 syn. sec. Dávila & al. 2006
- =Elymus minor (J.G. Sm.) M.E. Jones in Contr. W. Bot. 14: 20. 1912 syn. sec. Dávila & al. 2006