Science magazines
- Lahontan Cutthroat Trout
- Lake County Stonecrop
- Lake Erie Water Snake
- Lakela's Mint
- Lakeside Daisy
- Lanai Sandalwood
- Lane Mountain Milk-vetch
- Lange's Metalmark Butterfly
- Large Kauai Thrush
- Large-flowered Fiddleneck
- Large-flowered Skullcap
- Large-fruited Sand-verbena
- Last Chance Townsendia
- Lau 'ehu
- Laulihilihi
- Layne's Butterweed
- Laysan Duck
- Laysan Finch
- Leafy Prairie-clover
- Least Bell's Vireo