Vaccinium vitis-idaea
The Vaccinium vitis-idaea  often called lingonberry or cowberry, also called foxberry, mountain cranberry, red whortleberry, lowbush cranberry, partridgeberry (in Newfoundland and Cape Breton), and redberry (in Labrador)  is a small evergreen shrub in the flowering plant family Ericaceae that bears edible fruit.
It is seldom cultivated, but the fruits are commonly collected in the wild. The native habitat is the circumboreal forests of northern Eurasia and North America, extending from temperate into subarctic climates.

# Varieties
There are two very similar regional varieties of Vaccinium vitis-idaea in Eurasia and North America:
- Vaccinium vitis-idaea var. vitis-idaea L., Eurasia. Leaves 1025 mm long.
- Vaccinium vitis-idaea var. minus Lodd., North America. Leaves 720 mm long.

# Morphology
Cowberry shrubs of both varieties are typically 1040 cm in height and have a compact habit. They prefer some shade (as from a forest canopy) and constantly moist, acidic soil. Nutrient-poor soils are tolerated but not alkaline soils. They are extremely hardy, tolerating 40 C or lower, but grow poorly where summers are hot.
The plant is only semi-woody but keeps its leaves all winter even in the coldest years, unusual for a broadleaf plant, though they are usually protected from severe cold by snow cover. The plant spreads by underground rhizomes. The bell-shaped white flowers are produced in the early summer. The fruit, actually a false berry, is red and acidic, ripening in late summer to autumn.
The species resembles the related and similar cranberry (Vaccinium oxycoccus, V. microcarpum and V. macrocarpon), differing mainly in having white (not pink) flowers, with the petals partially enclosing the stamens and stigma (the petals are reflexed backwards in cranberries), and rounder, less pear-shaped berries. Other related plants in the genus Vaccinium include blueberries, bilberries, and huckleberries.

# Etymology
The name "lingonberry" originates from the Swedish word lingon for the native cowberry. Because the names mountain cranberry and lowbush cranberry perpetuate the longstanding confusion between the cranberry and the lingonberry, some botanists have suggested that these names should be avoided. Many restaurants and nutritionists however use and recommend these alternate names to help increase acceptance and consumption of this delicacy and exceptionally nutritious fruit that is unknown in many English-speaking countries.

# Uses
Lingonberries collected in the wild are a popular fruit in northern, central and eastern Europe, notably in Finland, Austria, Norway, Denmark, Sweden, the Baltic Countries, Poland, Slovakia, and Russia, where they can be picked on both public and private lands in accordance with the European tradition of "everyman's rights". Because the berries are quite tart, they are almost always cooked and sweetened before eating in the form of lingonberry jam, compote, juice, or syrup. The raw fruits are also frequently simply mashed with sugar, which preserves most of their nutrients and flavor and even enables storing them at room temperature (in closed but not necessarily sealed containers). Cowberries served this way or as compote often accompany game meats and liver dishes.  In Sweden and Norway, reindeer steak is traditionally served with gravy and cowberry sauce. Cowberry preserve is commonly eaten with meatballs and potatoes in Sweden. In Sweden and Russia, when sugar was still a luxury item, lingonberries were usually preserved simply by putting them whole into bottles of water.  This was known as vattlingon (watered lingonberries), and preserved them until next season.  This was also a home remedy against scurvy. In Russia this preserve had been known as "lingonberry water" ( ) and is a traditional soft drink. In Russian folk medicine lingonberry water had been used as mild laxative. A traditional Finnish dish is sauteed reindeer (poronkaristys) with mashed potatoes and cowberries, either cooked or raw with sugar. In Poland, cowberries are often mixed with pears to create a sauce served with poultry or game. Cowberries can also be used to replace red currants when creating the Cumberland sauce to give it a more sophisticated taste.
Cowberries are also popular as a wild picked fruit in North America in Newfoundland and Labrador, where they are locally known as partridgeberries.  In this region they are also incorporated into jams, syrups, and baked goods.
Lingonberries are a staple item in Sweden, and at the Swedish retailer IKEA. It is often sold as jam and juice in the store and as a key ingredient in dishes.
Lingonberries are used to make Lillehammer berry liqueur.
Cowberries are an important food for bears and foxes. Caterpillars of the Coleophoridae case-bearer moths Coleophora glitzella, Coleophora idaeella and Coleophora vitisella are not known to eat anything but lingonberry leaves.

## Nutritional properties
Cowberries contain plentiful organic acids, vitamin C, provitamin A (as beta carotene), B vitamins (B1, B2, B3), and the elements potassium, calcium, magnesium, and phosphorus. In addition to these healthful nutrients, cowberries also contain phytochemicals that are thought to counteract urinary-tract infections, and the seeds are rich in Omega-3 fatty acids.
Cowberries are used in herbal medicine. They were a major component in keeping people healthy in Sweden through the long winters without fresh vegetables. A coarse porridge with fat salt pork and lingonberry preserve was a classic meal of the winter, and a large crock of the berries preserved with sugar would be found in every larder. Owing to their high content of benzoic acid, they have the additional virtue of being able to be made into preserve without boiling.