Science magazines
- Lotis Blue Butterfly
- Louisiana Black Bear
- Louisiana Pearlshell
- Louisiana Quillwort
- Lower Keys Marsh Rabbit
- Lyon's Pentachaeta
- Lyonia Truncata Var. Proctorii
- Lyrate Bladderpod
- Lysimachia Filifolia
- Lysimachia Lydgatei
- Lysimachia Maxima
- Ma'o Hau Hele
- Ma'oli'oli
- Ma'oli'oli
- MacFarlane's Four-o'clock
- Madison Cave Isopod
- Magazine Mountain Shagreen
- Maguire Daisy
- Maguire Primrose
- Mahoe