Blueberries are perennial flowering plants with indigo-colored berries from the section Cyanococcus within the genus Vaccinium. Species in the section Cyanococcus are the most common fruits sold as "blueberries" and are native to North America.
A pie is a baked dish which is usually made of a pastry dough casing that covers or completely contains a filling of various sweet or savory ingredients. Pies are defined by their crusts.