Walking Fern
Wallflower
Wallrue
Walnut
Warty Panicgrass
Washington Hawthorn
Water Arum
Water Foxtail
Water Hemlock
Water Horsetail
Water Knotweed
Water Mint
Water Plantain
Water Pygmyweed
Water Smartweed
Water Speedwell
Water-starwort
Watercress
Waterhorehound
Waterlily
Watermelon
Watermilfoil
Waternymph
Waterparsnip
Waterplantain Spearwort
Watershield
Waterthread Pondweed
Waterweed
Waterwort
Wavy Hairgrass
Wavyleaf Aster
Waxflower Shinleaf
Waxyfruit Hawthorn
Waxyleaf Meadow-rue
Weak Rush
Weak Stellate Sedge
Weakstalk Bulrush
Wedgescale
Weeping Alkaligrass
Weeping Forsythia
Weld
Welsh Mudwort
West Indian Nightshade
Western Blue Virginsbower