White vervain 
Whitestem hedgenettle 
Whitish Germander 
Whole Leaf Indian Paintbrush 
Whorled Clary 
Whorled Lousewort 
Whorled Plectranthus 
Wild basil 
Wild Bergamot 
Wild Clary 
Wild dagga 
Wild jasmin 
Wingstem monkeyflower 
Winter jasmine 
Witchweed 
Wonga Vine 
Woodland germander 
Woolly foxglove 
Woolly Plectranthus 
Wyoming Paintbrush 
Yarrow broomrape 
Yellow Archangel 
Yellow broomrape 
Yellow Bugle