Native to:
Austria,
Belgium,
Czechoslovakia,
France,
Germany,
Great Britain,
Italy,
Netherlands,
Spain,
Switzerland
Introduced into:
Alaska,
Alberta,
Aleutian Is.,
Algeria,
Altay,
Amur,
Argentina Northeast,
Argentina Northwest,
Argentina South,
Arizona,
Arkansas,
Belarus,
Bolivia,
British Columbia,
Bulgaria,
Buryatiya,
California,
Cape Provinces,
Central European Russia,
Chile Central,
Chile South,
Colorado,
Connecticut,
Cuba,
Delaware,
Denmark,
District of Columbia,
Dominican Republic,
Ecuador,
Finland,
Free State,
Greece,
Haiti,
Idaho,
Illinois,
Indiana,
Iowa,
Ireland,
Irkutsk,
Jamaica,
Kansas,
Kazakhstan,
Kentucky,
Khabarovsk,
Kirgizstan,
KwaZulu-Natal,
Labrador,
Laos,
Louisiana,
Maine,
Manitoba,
Marianas,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Missouri,
Montana,
Morocco,
Myanmar,
Nebraska,
Nevada,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Carolina,
North Caucasus,
North Dakota,
North European Russia,
Northern Provinces,
Northwest Territories,
Norway,
Nova Scotia,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pennsylvania,
Peru,
Portugal,
Primorye,
Prince Edward I.,
Québec,
Rhode I.,
Romania,
Sardegna,
Saskatchewan,
South Carolina,
South Dakota,
South European Russia,
Sweden,
Tadzhikistan,
Tasmania,
Tennessee,
Texas,
Transcaucasus,
Ukraine,
Uruguay,
Utah,
Uzbekistan,
Vermont,
Virginia,
Washington,
West Virginia,
Wisconsin,
Wyoming,
Yakutskiya,
Yugoslavia,
Yukon