| Poaceae | |
Elymus trachycaulus fo. andinus
| (Scribn. & J.G. Sm.) Beetle | Phytologia 55(3): 210 | 1984 |
| Poaceae | |
Elymus trachycaulus subsp. andinus
| (Scribn. & J.G. Sm.) Á. Löve & D. Löve | Bot. Not. 128(4): 502 | 1975 [1976] |
| Poaceae | |
Elymus trachycaulus var. andinus
| (Scribn. & J.G. Sm.) Dorn | Vasc. Pl. Wyoming 298 | 1988 |
| Poaceae | |
Elymus trachycaulus subsp. bakeri
| (E.E. Nelson) Á. Löve | Feddes Repert. 95(7–8): 460 | 1984 |
| Poaceae | |
Elymus trachycaulus subsp. donianus
| (F.B. White) Á. Löve | Feddes Repert. 95(7–8): 461 | 1984 |
| Poaceae | |
Elymus trachycaulus subsp. glaucus
| (Pease & A.H. Moore) Cody | Canad. Field-Naturalist 108(1): 93 | 1994 |
| Poaceae | |
Elymus trachycaulus subsp. kamczadalorum
| (Nevski) Tzvelev | Novosti Sist. Vyssh. Rast. 10: 24 | 1973 |
| Poaceae | ** |
Elymus trachycaulus subsp. latiglumis
| Barkworth & D.R. Dewey | Great Basin Naturalist 43(4): 562 | 1983 [1984] |
| Poaceae | |
Elymus trachycaulus var. latiglumis
| (Scribn. & J.G. Sm.) Beetle | Phytologia 55(3): 209 | 1984 |
| Poaceae | ! |
Elymus trachycaulus subsp. major
| (Vasey) Tzvelev | Novosti Sist. Vyssh. Rast. 10: 24 | 1973 |
| Poaceae | |
Elymus trachycaulus var. major
| (Vasey) Beetle | Phytologia 55(3): 210 | 1984 |
| Poaceae | |
Elymus trachycaulus subsp. novae-angliae
| (Scribn.) Tzvelev | Novosti Sist. Vyssh. Rast. 10: 23 | 1973 |
| Poaceae | |
Elymus trachycaulus subsp. scribneri
| (Vasey) Á. Löve | Feddes Repert. 95(7–8): 461 | 1984 |
| Poaceae | |
Elymus trachycaulus subsp. sierrus
| (Gould) Á. Löve | Feddes Repert. 95(7–8): 461 | 1984 |
| Poaceae | |
Elymus trachycaulus subsp. stefanssonii
| (Melderis) Á. Löve & D. Löve | Bot. Not. 128(4): 502 | 1975 [1976] |
| Poaceae | * |
Elymus trachycaulus subsp. subsecundus
| (Link) Gould | | |
| Poaceae | ! |
Elymus trachycaulus subsp. subsecundus
| (Link) Á. Löve & D. Löve | Bot. Not. 128(4): 502 | 1975 [1976] |
| Poaceae | |
Elymus trachycaulus subsp. teslinensis
| (A.E. Porsild & Senn) Á. Löve | Taxon 29(1): 167 | 1980 |
| Poaceae | |
Elymus trachycaulus subsp. trachycaulus
| | | |
| Poaceae | |
Elymus trachycaulus var. trachycaulus
| | | |
| Poaceae | |
Elymus trachycaulus var. unilateralis
| (Cassidy) Beetle | Phytologia 55(3): 210 | 1984 |
| Poaceae | |
Elymus trachycaulus subsp. violaceus
| (Hornem.) Á. Löve & D. Löve | Bot. Not. 128(4): 502 | 1975 [1976] |
| Poaceae | |
Elymus trachycaulus var. violaceus
| (Hornem.) S.L. Welsh | Utah Fl. (ed. 4) 851 | 2008 |
| Poaceae | |
Elymus trachycaulus subsp. virescens
| (Lange) Á. Löve & D. Löve | Bot. Not. 128(4): 502 | 1975 [1976] |