Epipactis helleborine, not really a native but a European species that has established itself all across the northern USA and southern Canada. A very nice pale form of the species, though. We saw it just a week or two ago in western Michigan.
Hey Boy, you go around with open eyes.
Here in Germany Epipactis are very common in the forests, and along the roads. The flowering season is August. I even had it in my garden (for the joy of the plant-louses).