| Krombholzia latifolia E. Fourn., 1876 |
| Lachnagrostis Trin., 1820 |
| Lachnagrostis (Trin.) É. Desv., 1854 |
| Lachnagrostis avenacea (J.F. Gmel.) Veldkamp, 1992 |
| Lachnagrostis filiformis (G. Forst.) Trin., 1820 |
| Lachnagrostis retrofracta (Willd.) Trin., 1820 |
| Lachnagrostis willdenowii Trin., 1824 |
| Lachrymaria Heist. ex Fabr., 1759 |
| Lacryma Medik., 1789 |
| Laertia Gromov, 1817 |
| Lagurus L., 1753 |
| Lagurus cylindricus L., 1759 |
| Lagurus ovatus L., 1753 |
| Lamarckia Moench, 1794 |
| Lamarckia aurea (L.) Moench, 1794 |
| Lamarkia Moench, 1794 |
| Lamarkia tenella DC., 1813 |
| Lancearia Hitchc. & Chase, 1910 |
| Langsdorffia Regel, 1863 |
| Lanuginosa Hitchc. & Chase, 1910 |