| Lamiaceae | Mint family |
| Lauraceae | Sassafras family |
| Lentibulariaceae | Bladderwort family |
| Leskeaceae | |
| Leucobryaceae | |
| Liliaceae | Lily family |
| Limnanthaceae | Meadow-foam family |
| Linderniaceae | False-pimpernel family |
| Lycopodiaceae | Clubmoss family |
| Lythraceae | Loosestrife family |