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