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| Common Name | Scientific Name | |
| Water Hyacinth | Eichhornia crassipes | |
| Waterlilies | Nymphaea spp. | |
| Watermeal | Wolffia spp. | |
| Watermilfoil, Eurasian | Myriophyllum spicatum | |
| Water Plantain, American | Alisma subcordatum | |
| Waterpurslane | Ludwigia palustris | |
| Watershield | Brasenia schreberi | |
| Water-starwort | Callitriche heterophylla | |
| Waterthread Pondweed | Potamogeton diversifolius | |
| Water Willow | Justicia americana | |
| Western Salsify | Tragopogon dubius | |
| White Avens | Geum canadense | |
| White Campion | Silene alba | |
| White Clover | Trifolium repens | |
| White Flowered Mazus | Mazus japonicus | |
| White Heath Aster | Aster pilosus | |
| White Horehound | Marrubium vulgare | |
| White Sweet Clover | Melilotus alba | |
| Wild Basil | Satureja vulgaris | |
| Wild Bergamot | Monarda fistulosa | |
| Wild Buckwheat | Polygonum convolvulus | |
| Wild Carrot | Daucus carota | |
| Wild Chrysanthemum | Artemisia vulgaris | |
| Wild Four-O' Clock | Mirablis nyctaginea | |
| Wild Garlic | Allium canadense | |
| Wild Grape | Vitis spp. | |
| Wild Mustard | Brassica kaber | |
| Wild Pansy | Viola arvensis | |
| Wild Parsnip | Pastinaca sativa | |
| Wild Poinsettia | Euphorbia dentata | |
| Wild-proso Millet | Panicum miliaceum | |
| Wild Radish | Raphanus raphanistrum | |
| Wingstem | Verbesina alternifolia | |
| Wire Grass | Cynodon dactylon | |
| Witchgrass | Panicum capillare | |
| Woodrush | Luzula bulbosa | |
| Woodsorrel, Creeping | Oxalis corniculata | |
| Woodsorrel, Yellow | Oxalis stricta | |
| Wooly Ragwort | Senecio tomentosus |
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