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Cranberry - fruit of any of several small creeping or trailing plants of the genus Vaccinium (family Ericaceae), related to the blueberries. The small-fruited, or northern, cranberry is found in marshy land in northern North America and Asia and in northern and central Europe. Its stems are wiry and creeping; the leaves are evergreen, oval or elliptical, and less than 1.2 cm (0.5 inch) long. Its small flowers appear in June and have a four-lobed, rose-tinted corolla. Its round, crimson berries, which ripen in September, are about the size of currants and are often spotted; they have an acid taste.