Native to:
Afghanistan,
Alaska,
Albania,
Alberta,
Algeria,
Altay,
Amur,
Arizona,
Assam,
Austria,
Belarus,
British Columbia,
Bulgaria,
Buryatiya,
California,
China North-Central,
China South-Central,
China Southeast,
Chita,
Colorado,
Connecticut,
Corse,
Czechoslovakia,
East European Russia,
East Himalaya,
El Salvador,
France,
Germany,
Greece,
Guatemala,
Honduras,
Hungary,
Idaho,
Iowa,
Irkutsk,
Italy,
Japan,
Kamchatka,
Khabarovsk,
Kirgizstan,
Korea,
Krasnoyarsk,
Kuril Is.,
Labrador,
Lebanon-Syria,
Maine,
Manchuria,
Manitoba,
Maryland,
Massachusetts,
Mexico Central,
Mexico Gulf,
Mexico Northeast,
Mexico Northwest,
Mexico Southeast,
Mexico Southwest,
Michigan,
Minnesota,
Montana,
Morocco,
Myanmar,
Nepal,
Nevada,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Carolina,
North Caucasus,
North European Russi,
Northwest Territorie,
Nova Scotia,
Ontario,
Oregon,
Pakistan,
Pennsylvania,
Poland,
Primorye,
Prince Edward I.,
Qinghai,
Québec,
Romania,
Sakhalin,
Saskatchewan,
Sicilia,
Spain,
Switzerland,
Taiwan,
Tennessee,
Tibet,
Transcaucasus,
Turkey,
Turkey-in-Europe,
Tuva,
Ukraine,
Utah,
Vermont,
Vietnam,
Virginia,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yakutskiya,
Yugoslavia,
Yukon
Introduced into:
Belgium,
Central European Rus,
Denmark,
Finland,
Føroyar,
Great Britain,
Iceland,
Ireland,
New Zealand South,
Norway,
Portugal,
Sweden