Viola canadensis is native to Alaska, Canada, and the rich woodlands and river banks of the lower 48 states of the United States.  Although it is native, I personally have never seen it in the wild, but I wouldn't object to it.  It is often called "Tall White Violet," as it can grow to 14 inches.  The flower is white with a yellow center and central violet veining, with a purple tinge on the backs of the flowers.  The flowers are solitary, but more than one flowering stem may rise that will flower at the same time.  I have read that it reseeds heavily, but I have been growing it for a few years now and have yet to see a seed pod or a seed.  I wouldn't  object to that either.