Native to:
Afghanistan,
Alaska,
Albania,
Alberta,
Altay,
Amur,
Arizona,
Austria,
Baltic States,
Belarus,
Belgium,
British Columbia,
Bulgaria,
California,
Central European Rus,
China North-Central,
China South-Central,
Colorado,
Connecticut,
Czechoslovakia,
Delaware,
Denmark,
East European Russia,
Finland,
France,
Germany,
Great Britain,
Greenland,
Hungary,
Iceland,
Idaho,
Illinois,
Indiana,
Inner Mongolia,
Iowa,
Iran,
Ireland,
Italy,
Japan,
Kamchatka,
Kentucky,
Khabarovsk,
Korea,
Magadan,
Maine,
Manchuria,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Missouri,
Mongolia,
Montana,
Nebraska,
Netherlands,
Nevada,
New Hampshire,
New Jersey,
New Mexico,
New York,
North Dakota,
North European Russi,
Northwest European R,
Norway,
Ohio,
Ontario,
Oregon,
Pakistan,
Pennsylvania,
Poland,
Primorye,
Qinghai,
Québec,
Rhode I.,
Romania,
Saskatchewan,
South Dakota,
South European Russi,
Spain,
Sweden,
Switzerland,
Tennessee,
Texas,
Tibet,
Transcaucasus,
Turkey,
Ukraine,
Utah,
Vermont,
Virginia,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yakutskiya,
Yugoslavia,
Yukon