Doubtfully present in:
Assam,
East Himalaya
Native to:
Alabama,
Albania,
Arkansas,
China North-Central,
China South-Central,
China Southeast,
Connecticut,
Delaware,
East Aegean Is.,
Florida,
Georgia,
Greece,
Hungary,
Illinois,
Indiana,
Iran,
Japan,
Kentucky,
Korea,
Lebanon-Syria,
Louisiana,
Maine,
Maryland,
Massachusetts,
Michigan,
Mississippi,
Missouri,
New Hampshire,
New Jersey,
New York,
North Carolina,
North Caucasus,
Ohio,
Oklahoma,
Ontario,
Pennsylvania,
Rhode I.,
South Carolina,
Tennessee,
Texas,
Transcaucasus,
Turkey,
Turkey-in-Europe,
Vermont,
Virginia,
West Virginia,
Wisconsin,
Yugoslavia
Introduced into:
Algeria,
Austria,
Azores,
Belgium,
Bulgaria,
Canary Is.,
Corse,
Cuba,
Czechoslovakia,
Denmark,
Dominican Republic,
France,
Germany,
Great Britain,
Haiti,
Ireland,
Italy,
Jamaica,
Juan Fernández Is.,
Kriti,
Krym,
Madeira,
Morocco,
Netherlands,
Norway,
Poland,
Portugal,
Romania,
Sardegna,
Sicilia,
Spain,
Sweden,
Switzerland,
Taiwan,
Tunisia,
Ukraine,
Windward Is.