Native to:
Afghanistan,
Alaska,
Albania,
Alberta,
Altay,
Austria,
Azores,
Baltic States,
Belarus,
Belgium,
British Columbia,
Bulgaria,
California,
Central European Russia,
Colorado,
Connecticut,
Corse,
Czechoslovakia,
Denmark,
East European Russia,
East Himalaya,
Finland,
France,
Føroyar,
Germany,
Great Britain,
Greece,
Greenland,
Hungary,
Iceland,
Idaho,
Illinois,
Indiana,
Iran,
Ireland,
Italy,
Japan,
Kamchatka,
Kazakhstan,
Kirgizstan,
Kuril Is.,
Labrador,
Maine,
Manitoba,
Massachusetts,
Michigan,
Minnesota,
Montana,
Morocco,
Nepal,
Netherlands,
Nevada,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Caucasus,
North Dakota,
North European Russia,
Northwest European Russia,
Northwest Territories,
Norway,
Nova Scotia,
Nunavut,
Ohio,
Ontario,
Oregon,
Pennsylvania,
Poland,
Portugal,
Prince Edward I.,
Québec,
Rhode I.,
Romania,
Sakhalin,
Sardegna,
Saskatchewan,
Sicilia,
Spain,
Sweden,
Switzerland,
Tadzhikistan,
Ukraine,
Utah,
Uzbekistan,
Vermont,
Washington,
West Himalaya,
West Siberia,
Wisconsin,
Wyoming,
Yakutskiya,
Yugoslavia,
Yukon
Introduced into:
New Zealand North,
Tasmania