Native to:
Austria,
Baltic States,
Belarus,
Belgium,
Central European Rus,
Czechoslovakia,
Denmark,
East European Russia,
Finland,
France,
Føroyar,
Germany,
Great Britain,
Hungary,
Ireland,
Italy,
Netherlands,
North European Russi,
Northwest European R,
Norway,
Poland,
Romania,
South European Russi,
Spain,
Sweden,
Switzerland,
Ukraine,
Yugoslavia
Introduced into:
Alaska,
Alberta,
Connecticut,
Greenland,
Iceland,
Idaho,
Indiana,
Jawa,
Labrador,
Maine,
Manitoba,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Montana,
New Brunswick,
New Hampshire,
New Jersey,
New York,
Newfoundland,
Nova Scotia,
Ohio,
Ontario,
Pennsylvania,
Prince Edward I.,
Québec,
Rhode I.,
South Georgia,
Vermont,
Washington,
West Virginia,
Wisconsin