Native to:
Alabama,
Albania,
Algeria,
Argentina Northeast,
Argentina Northwest,
Argentina South,
Arkansas,
Austria,
Baltic States,
Belarus,
Belgium,
Borneo,
Bulgaria,
Burundi,
Central European Rus,
Chile Central,
Chile North,
Chile South,
Congo,
Connecticut,
Corse,
Czechoslovakia,
Delaware,
Denmark,
District of Columbia,
East European Russia,
Ethiopia,
Falkland Is.,
Finland,
Florida,
France,
Føroyar,
Georgia,
Germany,
Great Britain,
Greece,
Greenland,
Hungary,
Iceland,
Illinois,
Indiana,
Iran,
Ireland,
Italy,
Japan,
Kamchatka,
Kentucky,
Kenya,
Khabarovsk,
Krasnoyarsk,
Kuril Is.,
Labrador,
Louisiana,
Madeira,
Magadan,
Maine,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Mississippi,
Missouri,
Morocco,
Nepal,
New Brunswick,
New Hampshire,
New Jersey,
New York,
Newfoundland,
North Carolina,
North Caucasus,
North Dakota,
North European Russi,
Northwest European R,
Norway,
Nova Scotia,
Ohio,
Oklahoma,
Ontario,
Pennsylvania,
Philippines,
Poland,
Portugal,
Prince Edward I.,
Québec,
Romania,
Rwanda,
Sakhalin,
Sardegna,
Sicilia,
South Carolina,
South European Russi,
Spain,
Sweden,
Switzerland,
Taiwan,
Tanzania,
Tennessee,
Texas,
Transcaucasus,
Turkey,
Turkey-in-Europe,
Uganda,
Ukraine,
Uruguay,
Vermont,
Virginia,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Yugoslavia,
Zaïre
Introduced into:
Alaska,
Aleutian Is.,
Brazil South,
Brazil West-Central,
British Columbia,
California,
Cape Provinces,
Colorado,
Costa Rica,
Ecuador,
Hawaii,
Idaho,
Mexico Central,
New Zealand North,
New Zealand South,
Oregon,
Rhode I.,
South Georgia,
Tristan da Cunha,
Washington,
Wyoming,
Yukon