| Lolium perenne var. tenue (L.) Huds., 1778 |
| Lolium rigidum Gaudin, 1811 |
| Lolium scabrum J. Presl, 1830 |
| Lolium temulentum L., 1753 |
| Lolium temulentum var. multiflorum (Lam.) Kuntze, 1891 |
| Lolium tenue L., 1762 |
| Lombardochloa Roseng. & B.R. Arill., 1979 |
| Longivalvula Döll, 1877 |
| Lophopyrum Á. Löve, 1980 |
| Loretia Duval-Jouve, 1880 |
| Loudetia Hochst. ex A. Braun, 1841 |
| Loudetia flammida (Trin.) C.E. Hubb., 1936 |
| Louisiella C.E. Hubb. & J. Léonard, 1952 |
| Louisiella elephantipes (Nees ex Trin.) Zuloaga, 2014 |
| Loxostachys Peter, 1929 |
| Loxostachys uncinata (Raddi) Peter, 1930 |
| Loydia Delile, 1844 |
| Lucaea Kunth, 1831 |
| Ludolfia Willd., 1808 |
| Ludolfia glaucescens Willd., 1808 |