| Lepturus incurvatus (L.) Trin., 1820 |
| Lepturus incurvatus var. longiflorus Grossh., 1919 |
| Lepturus incurvus (L.) Druce, 1908 |
| Lepturus paniculatus Nutt., 1818 |
| Lepyroxis E. Fourn., 1886 |
| Lerchenfeldia Schur, 1866 |
| Lerchenfeldia flexuosa (L.) Schur, 1866 |
| Lesourdia E. Fourn., 1880 |
| Lesourdia karwinskyana E. Fourn., 1880 |
| Lesourdia multiflora E. Fourn., 1880 |
| Leucopoa Griseb., 1852 |
| Leymus Hochst., 1848 |
| Leymus (Hochst.) Honda, 1930 |
| Leymus condensatus (J. Presl) Á. Löve, 1980 |
| Leymus simplex (Scribn. & T.A. Williams) D.R. Dewey, 1983 |
| Leymus simplex var. luxurians (Scribn. & T.A. Williams) Beetle, 1984 |
| Leymus triticoides (Buckley) Pilg., 1947 |
| Leymus triticoides subsp. multiflorus (Gould) Á. Löve, 1980 |
| Libertia Lej., 1825 |
| Limnetis Rich., 1805 |