could this be Ammophila breviligulata?
Growing along the bank of a creek in moist woods.
Primrose-leaved? Lance-leaved? I never check the leaves well enough.
Viola sp.
Valmont Bog Preserve, Luzerne County, PA
26 May 2013
the smooth subspecies
"Smooth" downy yellow violet
Previously known as Northern White Violet?
This guy is tiny---see the second picture for scale