The purple pitcher plant (Sarracenia purpurea) is a carnivorous plant that is a member of the Sarraceniaceae family. It is found in the US along the East Coast and the Great Lakes regions as well as the south eastern two thirds of Canada. It is sometimes called the northern pitcher plant because it is the only member of its genus that is found in colder climates.
The purple pitcher plant is found in boggy habitats. Because the soil in bogs is usually poor in minerals and other nutrients the pitcher plant has evolved to find an alternative source of nutrients. The leaves of the pitcher plant form a cup or pitcher shape. New leaves, which are green like in the first pic, can produce digestive enzymes which collect in the pitcher. The plants then produce a sweet smell which entices insects, like the purplish fritillary above. When smaller insects try to feed they often slip on the slick leaves and fall into the liquid in the pitcher where they are slowly digested.