Native to:
Afghanistan,
Alabama,
Albania,
Alberta,
Altay,
Amur,
Arizona,
Arkansas,
Austria,
Baleares,
Baltic States,
Belarus,
Belgium,
Bolivia,
British Columbia,
Bulgaria,
Buryatiya,
California,
Cape Provinces,
Central European Rus,
China North-Central,
China South-Central,
China Southeast,
Chita,
Colombia,
Colorado,
Connecticut,
Corse,
Czechoslovakia,
Delaware,
Denmark,
District of Columbia,
East European Russia,
East Himalaya,
Ecuador,
Ethiopia,
Finland,
Florida,
France,
Free State,
Georgia,
Germany,
Great Britain,
Greece,
Guatemala,
Hungary,
Iceland,
Idaho,
Illinois,
Indiana,
Inner Mongolia,
Iowa,
Iran,
Ireland,
Irkutsk,
Italy,
Japan,
Kansas,
Kazakhstan,
Kentucky,
Kenya,
Kirgizstan,
Korea,
Krasnoyarsk,
Krym,
KwaZulu-Natal,
Lesotho,
Louisiana,
Malawi,
Manchuria,
Manitoba,
Maryland,
Massachusetts,
Mexico Central,
Mexico Gulf,
Mexico Northeast,
Mexico Northwest,
Mexico Southeast,
Mexico Southwest,
Michigan,
Minnesota,
Mississippi,
Missouri,
Montana,
Namibia,
Nebraska,
Nepal,
Netherlands,
Nevada,
New Hampshire,
New Jersey,
New Mexico,
New York,
North Carolina,
North Caucasus,
North Dakota,
North European Russi,
Northern Provinces,
Northwest European R,
Norway,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pakistan,
Pennsylvania,
Peru,
Poland,
Portugal,
Primorye,
Québec,
Rhode I.,
Romania,
Rwanda,
Sardegna,
Saskatchewan,
Sicilia,
South Carolina,
South Dakota,
South European Russi,
Spain,
Sudan,
Swaziland,
Sweden,
Switzerland,
Tadzhikistan,
Tanzania,
Tennessee,
Texas,
Transcaucasus,
Turkey,
Turkey-in-Europe,
Turkmenistan,
Tuva,
Uganda,
Ukraine,
Utah,
Uzbekistan,
Venezuela,
Virginia,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yakutskiya,
Yugoslavia,
Zambia,
Zaïre,
Zimbabwe
Introduced into:
Argentina South,
Maine,
New Brunswick,
Vermont