This endearing little violet with short hairs on its lower petals and violet striations that serve as nectar guides, is native to the moist woods and stream banks of the lower 48 states.   It is ideal for the home and/or woodland garden.  It is not invasive, but it can produce colonies (if you're lucky).  Viola striata grows from 8 to 16 inches in light shade and has a later and longer bloom period than most violets.  (Photo by Mason Brock (Masebrock) (Own Work) (Public domain via Wikimedia Commons)