Science magazines
- Lloyd's Mariposa Cactus
- Lo'ulu (Pritchardia affinis)
- Lo'ulu (Pritchardia aylmer-robinsonii)
- Lo'ulu (Pritchardia kaalae)
- Lo'ulu (Pritchardia munroi)
- Lo'ulu (Pritchardia napaliensis)
- Lo'ulu (Pritchardia remota)
- Lo'ulu (Pritchardia schattaueri)
- Lo'ulu (Pritchardia viscosa)
- Loach Minnow
- Lobelia Gaudichaudii ssp. Koolauensis
- Lobelia Monostachya
- Lobelia niihauensis
- Lobelia oahuensis
- Loch Lomond Coyote-thistle
- Loggerhead Sea Turtle
- Lompoc Yerba Santa
- Longhorn Fairy Shrimp
- Longspurred Mint
- Lost River Sucker