WordNet (r) 3.0 (2006):

white violet
    n 1: short-stemmed violet of eastern North America having
         fragrant purple-veined white flowers [syn: sweet white
         violet, white violet, woodland white violet, Viola
         blanda]
    2: tall North American perennial with heart-shaped leaves and
       white flowers with purple streaks [syn: Canada violet,
       tall white violet, white violet, Viola canadensis]