Labrador Buttercup
Lace Grass
Lacy Tansyaster
Ladyfern
Lambsquarters
Lambstongue Ragwort
Lamp Rush
Lance Selfheal
Lanceleaf Blazing Star
Lanceleaf Buckthorn
Lanceleaf Cottonwood
Lanceleaf Figwort
Lanceleaf Fogfruit
Lanceleaf Sage
Lanceleaf Tickseed
Laportea
Large Beardtongue
Large Indian Breadroot
Large St. Johnswort
Large Yellow Loosestrife
Largebract Indian Breadroot
Largebract Ticktrefoil
Largebracted Plantain
Largeflower Fameflower
Largeflower Hawksbeard
Largeflower Townsend Daisy
Largeleaf Pondweed
Largeleaf Wild Indigo
Larkspur
Lateflowering Goosefoot
Lateflowering Thoroughwort
Laurel Willow
Lavenderleaf Sundrops
Leadplant
Leafy Goosefoot
Leafy Pondweed
Leafy Spurge
Leafy Wildparsley
Least Duckweed
Leastdaisy
Leather Flower
Leathery Knotweed
Lemon Beebalm
Lemon Scurfpea