Identify Flowering Shrub
This shrub was found blooming adjacent to a trail in Central Virgina. The shrub was in a colony. The leaves are opposite and lead me to believe it is a viburnum, but which species. The flower is solitary, central vein or midrib in leaf, and serrated edge on the leaf. I thought it might be an elderberry, they have flower clusters and its too early to bloom.
The area the shrub was colonizing is at the bottom of a ridge and would tend to be wetter than surrounding area.