Off trail in the woods near the Welcome Center .... It should not be called wintergreen, but Round-leaved Pyrola.
Pyrola L. (syn. Pirola Neck.) is a genus of evergreen herbaceous plants in the family Ericaceae. Under the old Cronquist system it was placed in its own family Pyrolaceae, but genetic research showed it belonged in the family Ericaceae. The species are commonly known as wintergreen, a name shared with several other related and unrelated plants (see wintergreen for details). They are native to northern temperate and Arctic regions.