Warionia 
Water Snowflake 
Wavy Marshwort 
Wavy-leaved American Aster 
Wedgeleaf Goldenbush 
Welted thistle 
Werneria nubigena 
West Coast Canada goldenrod 
West pearly everlasting 
Western meadow aster 
Western Salsify 
Wheeler's Thistle 
Whip pussytoes 
White Arrowleaf Aster 
White butterbur 
White daisy-burr 
White fan-flower 
White Flat-topped Goldenrod 
White Heath Aster 
White paper daisy 
White rattlesnake root 
White root 
White snakeroot 
White tackstem