Native to:
Afghanistan,
Alabama,
Alaska,
Albania,
Alberta,
Aleutian Is.,
Algeria,
Altay,
Amur,
Austria,
Azores,
Baleares,
Baltic States,
Belarus,
Belgium,
British Columbia,
Bulgaria,
Buryatiya,
Canary Is.,
Cape Verde,
Central European Rus,
China North-Central,
China South-Central,
China Southeast,
Chita,
Connecticut,
Corse,
Cyprus,
Czechoslovakia,
Delaware,
Denmark,
District of Columbia,
Djibouti,
East Aegean Is.,
East European Russia,
East Himalaya,
Eritrea,
Ethiopia,
Finland,
France,
Føroyar,
Georgia,
Germany,
Great Britain,
Greece,
Greenland,
Hungary,
Iceland,
Illinois,
Indiana,
Iowa,
Iran,
Ireland,
Irkutsk,
Italy,
Japan,
Kamchatka,
Kazakhstan,
Kentucky,
Kenya,
Khabarovsk,
Kirgizstan,
Korea,
Krasnoyarsk,
Kriti,
Krym,
Kuril Is.,
Labrador,
Lebanon-Syria,
Libya,
Madeira,
Magadan,
Manchuria,
Manitoba,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Mississippi,
Missouri,
Mongolia,
Morocco,
Nepal,
Netherlands,
New Jersey,
New York,
North Carolina,
North Caucasus,
North European Russi,
Northwest European R,
Northwest Territorie,
Norway,
Nunavut,
Ohio,
Ontario,
Pakistan,
Palestine,
Pennsylvania,
Poland,
Portugal,
Primorye,
Québec,
Romania,
Rwanda,
Sakhalin,
Sardegna,
Saskatchewan,
Saudi Arabia,
Sicilia,
Somalia,
South European Russi,
Spain,
Sudan,
Sweden,
Switzerland,
Tadzhikistan,
Taiwan,
Tanzania,
Tennessee,
Tibet,
Transcaucasus,
Tunisia,
Turkey,
Turkey-in-Europe,
Tuva,
Uganda,
Ukraine,
Uzbekistan,
Vermont,
Virginia,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Xinjiang,
Yakutskiya,
Yugoslavia,
Yukon,
Zaïre
Introduced into:
Argentina South,
Arkansas,
California,
Cape Provinces,
Chile Central,
Chile South,
Idaho,
Kerguelen,
Louisiana,
Maine,
Montana,
New Hampshire,
New Mexico,
New South Wales,
New Zealand North,
New Zealand South,
Newfoundland,
Oklahoma,
Oregon,
Rhode I.,
South Carolina,
Tasmania,
Texas,
Uruguay,
Utah