Whorled Wood Aster 
Wide-leaved bellflower 
Wig Knapweed 
Willowleaf Lettuce 
Winged Everlasting Daisy 
Wingstem 
Wolf's Bane 
Woodbridge poison 
Woodland Black-eyed Susan 
Woodland lettuce 
Woodland Madia 
Woodland ragwort 
Woodland Sunflower 
Woolly burdock 
Woolly Everlasting 
Woolly hawkweed 
Woolly pussytoes 
Woolly Thistle 
Wormwood 
Wrinkleleaf goldenrod 
Xeranthemum annuum 
Xeranthemum cylindraceum 
Yacón 
Yam daisy