Native to:
Albania,
Aleutian Is.,
Altay,
Amur,
Austria,
Baltic States,
Belarus,
Belgium,
Bulgaria,
Buryatiya,
California,
Central European Rus,
China North-Central,
China South-Central,
China Southeast,
Chita,
Czechoslovakia,
Denmark,
East European Russia,
Finland,
France,
Georgia,
Germany,
Great Britain,
Hungary,
Iceland,
Illinois,
Indiana,
Inner Mongolia,
Iowa,
Ireland,
Irkutsk,
Italy,
Japan,
Kamchatka,
Kazakhstan,
Kentucky,
Khabarovsk,
Kirgizstan,
Korea,
Krasnoyarsk,
Kuril Is.,
Labrador,
Laos,
Magadan,
Maine,
Manchuria,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Missouri,
Mongolia,
Netherlands,
New York,
Newfoundland,
North Carolina,
North Caucasus,
North Dakota,
North European Russi,
Northwest European R,
Norway,
Nunavut,
Ohio,
Ontario,
Oregon,
Poland,
Portugal,
Primorye,
Qinghai,
Québec,
Romania,
Sakhalin,
South Dakota,
South European Russi,
Spain,
Sweden,
Switzerland,
Tennessee,
Tibet,
Transcaucasus,
Turkey,
Turkey-in-Europe,
Tuva,
Ukraine,
Virginia,
Washington,
West Siberia,
Wisconsin,
Xinjiang,
Yakutskiya,
Yugoslavia