When I was hiking on Sunday through Zealand Notch in New Hampshire's White Mountains, I saw this delicate flower by the side of the trail. It has a puffy, balloon like shape.
When I got home, I looked it up in my Pocket Naturalist Guide to New England Trees and & Wildflowers. Turns out that it is known by many names including Pink Lady's Slipper and Pink Moccasin Flower (Cypripedium acaule.)
If you are interested in plant, flower, tree, insect or animal identification, I highly recommend that you buy one of these Pocket Naturalist Guides. They weigh slightly more than 1 oz and have pictures to help you identify the different species you see along the trail.
After a little more research, I discovered that Pink Lady's Slipper is a member of the orchid family, and like Indian Pipe, it has a symbiotic relationship with a fungus in the soil around it that provides it with nutrients. It grows in New England and Canada in acidic woods, flowering from May to July.
Interesting stuff, if you pay attention to the woods and animals around you while you're huffing and puffing along the trail.