| Limnodea arkansana var. pilosa (Trin.) Scribn., 1900 |
| Lingnania McClure, 1940 |
| Lithachne P. Beauv., 1812 |
| Lithachne axillaris P. Beauv., 1812 |
| Lithachne pauciflora (Sw.) P. Beauv., 1812 |
| Lithagrostis Gaertn., 1788 |
| Lithagrostis lacryma-jobi (L.) Gaertn., 1788 |
| Lodicularia P. Beauv., 1812 |
| Lodicularia capensis (Trin.) Nees, 1841 |
| Lodicularia fasciculata (Lam.) P. Beauv., 1812 |
| Lodicularia peruviana Nees ex Meyen, 1834 |
| Loliinae Dumort., 1829 |
| Lolium L., 1753 |
| Lolium aristatum Lag., 1816 |
| Lolium arundinaceum (Schreb.) Darbysh., 1993 |
| Lolium brasilianum Nees, 1829 |
| Lolium canadense Bernh. ex Rouville, 1853 |
| Lolium cylindricum (Willd.) Asch. ex Graebn., 1902 |
| Lolium italicum A. Braun, 1834 |
| Lolium italicum var. italicum A. Braun, 1834 |