Walkingstick Cactus
Wall Barley
Wallflower
Wallrocket
Walnut
Waltheria
Wand Fleabane
Wand Holdback
Wand Mullein
Warty Caltrop
Warty Spurge
Wasatch Desertparsley
Washerwoman
Washoe Phacelia
Water Birch
Water Foxtail
Water Hemlock
Water Hyacinth
Water Jacket
Water Knotweed
Water Lettuce
Water Minerslettuce
Water Mudwort
Water Plantain
Water Pygmyweed
Water Sedge
Water Smartweed
Water Speedwell
Water Whorlgrass
Water-starwort
Water-willow
Waterbuttons
Waterclover
Watercress
Waterhorehound
Waterhyssop
Waterleaf
Waterlily
Watermelon
Watermilfoil
Watermoss
Waternymph
Waterparsnip
Waterthread Pondweed