Science magazines
- Warner Sucker
- Water Howellia
- Watercress Darter
- Wawa'iole
- Wawae'iole
- Welsh's Milkweed
- Wenatchee Mountains Checker-mallow
- West Indian Manatee
- Western Lily
- Western Prairie Fringed Orchid
- Western Snowy Plover
- Wheeler's Peperomia
- White Birds-in-a-nest
- White Bladderpod
- White Catspaw Pearlymussel
- White Irisette
- White River Spinedace
- White River Springfish; Hiko White River Springfish
- White Sedge
- White Sturgeon