Viola pallens
Northern White Violet
Violaceae
Northern White Violet
Violaceae
Interesting info: The Southern Appalachian Wildflowers Site has a lovely Violets Page and also a very useful page for identification of violets.
Another good violets link - with a list of the USDA violets pages.
You ought to know:
Area: Low, wet
Height: 1-5 inches
Frequency: Low
Blooms: Early Spring