Science magazines
- Diplazium molokaiense
- Dismal Swamp Southeastern Shrew
- Dromedary Pearlymussel
- Dudley Bluffs Bladderpod
- Dudley Bluffs Twinpod
- Duskytail Darter
- Dwarf Bear-poppy
- Dwarf Iliau
- Dwarf Lake Iris
- Dwarf Naupaka
- Dwarf Wedgemussel
- Dwarf-flowered Heartleaf
- Eastern Indigo Snake
- Eastern Prairie Fringed Orchid
- Eastern Puma
- Eggert's Sunflower
- El Dorado Bedstraw
- El Segundo Blue Butterfly
- Elaphoglossum serpens
- Elfin Tree Fern