- Lady-slipper, Large Yellow
- Lady-slipper, Small Yellow
- Lady-slipper, Pink
- Ladies Thumb
- Ladies Tresses, Nodding
- Ladies Tresses, Slender
- Ladies Tresses, Spring
- Ladies Tresses, Yellow
- Lance-leaved or Mountain Anemone
- Leafcup, Large-flowered
- Leafcup, Small- or Pale-flowered
- Leatherflower
- Leatherflower, Millboro
- Leatherflower, White-haired
- Lettuce, Prickly
- Lettuce Saxifrage
- Lettuce, Tall Blue
- Lettuce, Tall White
- Lettuce, Wild
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- Lettuce, Woodland
- Lily, Fragrant Water or American White
- Lily, Turk's Cap
- Lily, Wood
- Lion's Foot
- Lobelia, Downy
- Lobelia, Great
- Lobelia, Nuttals
- Lobelia,Spiked
- Loosestrife, Earth
- Loosestrife, Fringed
- Loosestrife, Purple
- Loosestrife, Whorled
- Loosestrife, Winged
- Lyre-leaved Sage
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