Apocynum androsaemifolium. This grows on the East Coast too, apparently.
I need to get a decent pic of this. Unfortunately, it almost always grows with poison oak. Supposedly, you can crush the stems and rub them on places where you think you've touched poison oak to prevent getting it. I always used to do this as a kid. Not sure it ever worked.
Rubus odoratus. This is basically the East Coast equivalent of thimbleberry.
Gaultheria procumbens. Very common in wooded areas.
Much as I might hesitate to express my abhorrence for an entire group of organisms, the tabanid flies leave me no choice. They are a vile horde of blood-sucking fiends, and they do not deserve their beautiful eyes.
Turns out helleborine grows wild here too.
Growing up, we were never in New Hampshire early enough to see this in flower, but I remember seeing these blue berries every summer. Turns out it's a spcies of Clintonia, a genus I now know from the West Coast's Clintonia andrewsiana!