Native to:
Albania,
Aleutian Is.,
Altay,
Amur,
Austria,
Baltic States,
Belarus,
Belgium,
Bulgaria,
Buryatiya,
California,
Central European Russia,
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 Russia,
Northwest European Russia,
Norway,
Nunavut,
Ohio,
Ontario,
Oregon,
Poland,
Portugal,
Primorye,
Qinghai,
Québec,
Romania,
Sakhalin,
South Dakota,
South European Russia,
Spain,
Sweden,
Switzerland,
Tennessee,
Tibet,
Transcaucasus,
Turkey,
Turkey-in-Europe,
Tuva,
Ukraine,
Virginia,
Washington,
West Siberia,
Wisconsin,
Xinjiang,
Yakutskiya,
Yugoslavia