Lace Grass
Lady's Slipper
Lady's Tresses
Ladyfern
Lagerstroemia
Lakecress
Lamarck's Bedstraw
Lambsquarters
Lamp Rush
Lance Asplenium
Lance Selfheal
Lanceleaf Buckthorn
Lanceleaf Figwort
Lanceleaf Fogfruit
Lanceleaf Loosestrife
Lanceleaf Ragweed
Lanceleaf Sage
Lanceleaf Tickseed
Lanceleaf Wild Licorice
Lapham's Phlox
Lapland Sedge
Laportea
Larch
Large Beardtongue
Large Gray Willow
Large St. Johnswort
Large Whorled Pogonia
Largebract Ticktrefoil
Largebracted Plantain
Largeflower Bellwort
Largeflower Tickseed
Largeflower Valerian
Largeflower Yellow False Foxglove
Largefruit Blacksnakeroot
Largeleaf Phlox
Largeleaf Pondweed
Largeleaf Waterleaf
Largeleaf Wild Indigo
Largeseed Forget-me-not
Larkspur
Late Purple Aster
Lateflowering Goosefoot
Lateflowering Thoroughwort
Laurel