Native to:
Alaska,
Albania,
Alberta,
Altay,
Amur,
Arizona,
Austria,
Baltic States,
Belgium,
British Columbia,
Bulgaria,
Buryatiya,
Central European Rus,
China North-Central,
Chita,
Colorado,
Connecticut,
Corse,
Czechoslovakia,
Denmark,
East European Russia,
Finland,
France,
Føroyar,
Germany,
Great Britain,
Greece,
Greenland,
Hungary,
Iceland,
Idaho,
Illinois,
Inner Mongolia,
Iowa,
Ireland,
Irkutsk,
Italy,
Japan,
Kamchatka,
Kazakhstan,
Khabarovsk,
Korea,
Krasnoyarsk,
Krym,
Kuril Is.,
Labrador,
Magadan,
Maine,
Manchuria,
Manitoba,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Montana,
Netherlands,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Dakota,
North European Russi,
Northwest European R,
Northwest Territorie,
Norway,
Nova Scotia,
Nunavut,
Ohio,
Ontario,
Oregon,
Pennsylvania,
Poland,
Primorye,
Prince Edward I.,
Québec,
Rhode I.,
Romania,
Sakhalin,
Saskatchewan,
South Dakota,
Spain,
Sweden,
Switzerland,
Transcaucasus,
Turkey,
Tuva,
Ukraine,
Utah,
Vermont,
Washington,
West Siberia,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yakutskiya,
Yugoslavia,
Yukon