Blueberries Are Low in Calories But High in Nutrients The blueberry bush (Vaccinium sect. Cyanococcus) is a flowering shrub that produces berries with a bluish, purple hue — also known as blueberries. It is closely related to similar shrubs, such as those that produce cranberries and huckleberries. Blueberries are an antioxidant-rich fruit that may provide several health benefits.