Lingon

Vaccinium vitis-idaea, the lingonberry, partridgeberry,[a] mountain cranberry or cowberry, is a small evergreen shrub in the heath family Ericaceae. It is native to boreal forest and Arctic tundra throughout the Northern Hemisphere, including Eurasia and North America. Commercially cultivated in the United States Pacific Northwest and the Netherlands, the edible berries are also picked in the wild and used in various dishes, especially in Nordic cuisine. Vaccinium vitis-idaea spreads by underground stems to form dense clonal colonies. Slender and brittle roots grow from the underground stems. The stems are rounded in cross-section and grow from 10 to 40 cm in height. Leaves grow alternately and are oval, 5–30 mm (1⁄4–1+1⁄8 in) long, with a slightly wavy margin, and sometimes with a notched tip.

Source: Wikipedia