I once met a librarian from Reading. She mentioned wild orchids growing on her property. I think you have the same species which is European and has naturalized over N. Amerca. Epipactis helleborine Here is a link that might be useful: images

This book just has black and white sketches but it lists trees and wildflowers and animals etc of the Poconos. The title is The Poconos - An illustrated Natural History Guide by Carl S Oplinger and Robert Halma I bought it at the Barnes and Nobles in Wilkes Barre. They have a really good section on PA and the Poconos.

Found this question while on a different search. Long past the initial inquiry, but some ideas if you're still dealing with this. If the weed grasses are identified correctly, you could consider using Imazapic herbicide (Plateau, Panoramic, or a generic) at 4 to 8 ounces per acre for control with minimal damage to the desirable native wildflowers and grasses, and possibly none depending on what was in your planted mix and what rate you use. Use higher rates if there is a lot of growth or old plant litter. Use lower rates if the site has been cleaned of by burning. It can be applied both Pre-emergent (like right after a burn or mowing) or Post-emergent after the weeds are up, but works best if done early in the growing season before the weeds get too far along. Can be broadcast sprayed over the entire area or selectively sprayed with a wand to avoid application to desirable plants. Another herbicide that works well is Mesotrione, but best applied by selective spraying with a wand as it may cause more damage to some of the native wildflowers.

No. Any plant poison that will kill what we consider "weed" grasses will also kill off what we consider the desirable grasses.