| Elymus sitanion Schult., 1824 |
| Elymus smithii (Rydb.) Gould, 1947 |
| Elymus spicatus (Pursh) Gould, 1947 |
| Elymus stebbinsii Gould, 1947 |
| Elymus subsecundus (Link) Á. Löve & D. Löve, 1964 |
| Elymus trachycaulus (Link) Gould ex Shinners, 1954 |
| Elymus trachycaulus (Link) Hoover, 1966 |
| Elymus trachycaulus subsp. subsecundus (Link) Á. Löve & D. Löve, 1975 |
| Elymus trachycaulus subsp. trachycaulus (Link) Gould ex Shinners, 1954 |
| Elymus trachycaulus var. trachycaulus (Link) Gould ex Shinners, 1954 |
| Elymus trachycaulus var. unilaterale (Cassidy) Beetle, 1984 |
| Elymus triticoides Buckley, 1862 |
| Elymus triticoides subsp. multiflorus Gould, 1945 |
| Elymus triticoides subsp. triticoides Buckley, 1862 |
| Elymus triticoides var. pubescens Hitchc., 1912 |
| Elymus vaillantianus (Wulfen & Schreb.) K.B. Jensen, 1989 |
| Elymus x pseudorepens (Scribn. & J.G. Sm.) Barkworth, 1983 |
| Elyonurus Kunth & Bonpl. ex Willd., 1806 |
| Elyonurus adustus (Trin.) Ekman, 1913 |
| Elyonurus argenteus Nees, 1841 |