Wallflower
Walnut
Warty Spurge
Water Arum
Water Birch
Water Foxtail
Water Hemlock
Water Horsetail
Water Knotweed
Water Mudwort
Water Plantain
Water Sedge
Water Smartweed
Water Speedwell
Water Whorlgrass
Water-starwort
Waterclover
Waterhorehound
Waterhyssop
Waterleaf
Watermeal
Watermilfoil
Waternymph
Waterparsnip
Waterthread Pondweed
Waterweed
Waterwort
Wavy Hairgrass
Wavyleaf Thistle
Wax Currant
Waxflower Shinleaf
Waxleaf Penstemon
Wedgescale
Weeping Alkaligrass
West Indian Nightshade
Western Brackenfern
Western Dock
Western Dwarf Cliffbrake
Western False Dragonhead
Western Fineleaf Pondweed
Western Germander
Western Marbleseed
Western Marsh Cudweed
Western Oakfern