Native to:
Afghanistan,
Alabama,
Alaska,
Alberta,
Aleutian Is.,
Altay,
Amur,
Arkansas,
Assam,
Austria,
Baltic States,
Bangladesh,
Belarus,
Bismarck Archipelago,
Borneo,
British Columbia,
Bulgaria,
Buryatiya,
California,
Cambodia,
Central European Rus,
China North-Central,
China South-Central,
China Southeast,
Chita,
Colorado,
Connecticut,
Czechoslovakia,
Delaware,
East Aegean Is.,
East European Russia,
East Himalaya,
Finland,
Florida,
France,
Georgia,
Germany,
Greenland,
Hainan,
Idaho,
Illinois,
India,
Inner Mongolia,
Irkutsk,
Italy,
Japan,
Jawa,
Kamchatka,
Kazakhstan,
Kentucky,
Khabarovsk,
Korea,
Krasnoyarsk,
Kuril Is.,
Labrador,
Laos,
Lebanon-Syria,
Lesser Sunda Is.,
Louisiana,
Magadan,
Maine,
Malaya,
Maluku,
Manchuria,
Manitoba,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Mississippi,
Missouri,
Mongolia,
Montana,
Myanmar,
Nansei-shoto,
Nepal,
Nevada,
New Brunswick,
New Guinea,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Carolina,
North Caucasus,
North European Russi,
Northwest European R,
Northwest Territorie,
Norway,
Nova Scotia,
Nunavut,
Ogasawara-shoto,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pakistan,
Pennsylvania,
Philippines,
Poland,
Portugal,
Primorye,
Prince Edward I.,
Qinghai,
Queensland,
Québec,
Rhode I.,
Romania,
Sakhalin,
Saskatchewan,
Solomon Is.,
South Carolina,
Spain,
Sri Lanka,
Sulawesi,
Sumatera,
Sweden,
Switzerland,
Taiwan,
Tennessee,
Texas,
Thailand,
Tibet,
Transcaucasus,
Turkey,
Turkey-in-Europe,
Tuva,
Ukraine,
Utah,
Vermont,
Vietnam,
Virginia,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Wyoming,
Yakutskiya,
Yugoslavia,
Yukon
Introduced into:
Azores,
Belgium,
Great Britain,
Gulf of Guinea Is.,
Ireland,
Madeira,
Netherlands