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