Native to:
Afghanistan,
Alabama,
Alaska,
Albania,
Alberta,
Aleutian Is.,
Algeria,
Altay,
Amur,
Antipodean Is.,
Argentina Northeast,
Argentina Northwest,
Argentina South,
Arizona,
Arkansas,
Austria,
Azores,
Baltic States,
Belarus,
Belgium,
Bolivia,
Borneo,
Brazil South,
Brazil Southeast,
British Columbia,
Bulgaria,
Buryatiya,
California,
Cameroon,
Canary Is.,
Cape Provinces,
Central European Russia,
Chad,
Chatham Is.,
Chile Central,
Chile North,
Chile South,
China North-Central,
China South-Central,
China Southeast,
Chita,
Colombia,
Colorado,
Connecticut,
Corse,
Costa Rica,
Cyprus,
Czechoslovakia,
Delaware,
Denmark,
District of Columbia,
East Aegean Is.,
East European Russia,
East Himalaya,
Ecuador,
Ethiopia,
Falkland Is.,
Finland,
Florida,
France,
Free State,
Føroyar,
Georgia,
Germany,
Great Britain,
Greece,
Greenland,
Guatemala,
Gulf of Guinea Is.,
Hawaii,
Hungary,
Iceland,
Idaho,
Illinois,
India,
Indiana,
Inner Mongolia,
Iowa,
Iran,
Ireland,
Irkutsk,
Italy,
Japan,
Juan Fernández Is.,
Kamchatka,
Kansas,
Kazakhstan,
Kentucky,
Kenya,
Khabarovsk,
Kirgizstan,
Korea,
Krasnoyarsk,
Kriti,
Krym,
Kuril Is.,
KwaZulu-Natal,
Labrador,
Lebanon-Syria,
Lesotho,
Louisiana,
Macquarie Is.,
Madeira,
Magadan,
Maine,
Manchuria,
Manitoba,
Maryland,
Massachusetts,
Mexico Central,
Mexico Gulf,
Mexico Northeast,
Mexico Northwest,
Mexico Southeast,
Mexico Southwest,
Michigan,
Minnesota,
Mississippi,
Missouri,
Mongolia,
Montana,
Morocco,
Myanmar,
Nansei-shoto,
Nepal,
Netherlands,
Nevada,
New Brunswick,
New Guinea,
New Hampshire,
New Jersey,
New Mexico,
New South Wales,
New York,
New Zealand North,
New Zealand South,
Newfoundland,
Norfolk Is.,
North Carolina,
North Caucasus,
North Dakota,
North European Russia,
Northern Provinces,
Northwest European Russia,
Northwest Territories,
Norway,
Nova Scotia,
Nunavut,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pakistan,
Panamá,
Pennsylvania,
Peru,
Philippines,
Poland,
Portugal,
Primorye,
Prince Edward I.,
Qinghai,
Queensland,
Québec,
Rhode I.,
Romania,
Rwanda,
Sakhalin,
Sardegna,
Saskatchewan,
Sicilia,
South Australia,
South Carolina,
South Dakota,
South European Russia,
Spain,
Sulawesi,
Svalbard,
Sweden,
Switzerland,
Tadzhikistan,
Taiwan,
Tanzania,
Tasmania,
Tennessee,
Texas,
Tibet,
Transcaucasus,
Tunisia,
Turkey,
Turkey-in-Europe,
Turkmenistan,
Tuva,
Uganda,
Ukraine,
Uruguay,
Utah,
Uzbekistan,
Venezuela,
Vermont,
Victoria,
Virginia,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Western Australia,
Wisconsin,
Wyoming,
Xinjiang,
Yakutskiya,
Yugoslavia,
Yukon,
Zaïre
Introduced into:
Kerguelen