Labrador Buttercup
Labrador Tea
Lace Lipfern
Lacefern
Lacy Tansyaster
Ladyfern
Lakeshore Sedge
Lambsquarters
Lambstongue Ragwort
Lance Selfheal
Lanceleaf Cottonwood
Lanceleaf Figwort
Lanceleaf Goldenweed
Lanceleaf Grapefern
Lanceleaf Sage
Lanceleaf Springbeauty
Lancepod Draba
Larch
Larch Dwarf Mistletoe
Larchleaf Beardtongue
Large Beardtongue
Large Boykinia
Large Indian Breadroot
Large Knotweed
Large Mountain Fleabane
Large St. Johnswort
Large Yellow Loosestrife
Largebract Indian Breadroot
Largebracted Plantain
Largeflower Fleabane
Largeflower Goldenweed
Largeflower Hawksbeard
Largeflower Triteleia
Largeleaf Avens
Largeleaf Lupine
Largeleaf Pondweed
Largeleaf Sandwort
Larger Western Mountain Aster
Larkspur
Laurel
Laurel Willow
Lava Aster
Lawndaisy
Lax-flowered Green Orchid