UMass Extension Weed Herbarium
| Common Name | Scientific Name | Family Name | |
|---|---|---|---|
| wallflower, worm-seed | see - mustard, wallflower | ||
| water hemlock, spotted | Cicuta maculata | Apiaceae (Umbelliferae) - Carrot Family | |
| water-horehound | see - bugleweed, american | ||
| water-horehound, cut-leaves | see - bugleweed, american | ||
| watergrass | see - barnyardgrass | ||
| waygrass | see - knotweed, prostrate | ||
| wheatgrass | see - quackgrass | ||
| whiteman's footprint | see - plantain, broadleaf | ||
| whitlow grass, spring | Draba verna | Brassicaceae (Cruciferae) - Mustard Family | |
| whitlowwort | see - whitlow grass, spring | ||
| wild rye, Canadian | Elymus canadensis | Poaceae (Graminae) - Grass Family | |
| willowherb, American | Epilobium ciliatum | Onagraceae - Evening Primrose Family | |
| willowherb, glanular | see - willowherb, American | ||
| willowherb, great | see - fireweed | ||
| wineberry, wine raspberry | Rubus phoenicolasius | Rosaceae - Rose Family | |
| wingstem | Verbesina alternifolia | Asteraceae (Compositae) - Aster or Sunflower Family | |
| wintergrass | see - bluegrass, annual | ||
| wiregrass | see - goose grass | ||
| witchgrass | Panicum capillare | Poaceae (Graminae) - Grass Family | |
| woodbine | see - Virginia creeper | ||
| woodgrass | see - Indiangrass, yellow | ||
| woodsorrel, creeping | Oxalis corniculata | Oxalidaceae - Woodsorrel Family | |
| woodsorrel, yellow | Oxalis stricta | Oxalidaceae - Woodsorrel Family | |
| wormseed | see - Mexicantea, wormseed |