I am not certain about this white Viola odorata.  I have grown Viola odorata alba, "Santa's Beard," "St. Wite," and "Sisters," all white violets, but these did not have labels last year, so I'm not sure which one it is and having nothing labeled to compare it with.   I will keep watching, but for now,  it is just known as "white."   In any case, it is lovely, with a nice scent and large blooms.  The name may change in time, but the violet will remain the same.