Native to:
Afghanistan,
Alaska,
Albania,
Alberta,
Algeria,
Altay,
Amur,
Arizona,
Austria,
Baltic States,
Belarus,
Belgium,
British Columbia,
Bulgaria,
Buryatiya,
California,
Central European Rus,
Chita,
Colorado,
Connecticut,
Corse,
Czechoslovakia,
Denmark,
East Aegean Is.,
East European Russia,
Finland,
France,
Føroyar,
Germany,
Great Britain,
Greece,
Hungary,
Iceland,
Idaho,
Illinois,
Indiana,
Iowa,
Iran,
Ireland,
Irkutsk,
Italy,
Japan,
Kamchatka,
Kansas,
Kazakhstan,
Kirgizstan,
Korea,
Krasnoyarsk,
Krym,
Kuril Is.,
Labrador,
Lebanon-Syria,
Libya,
Magadan,
Maine,
Manchuria,
Manitoba,
Massachusetts,
Mexico Central,
Mexico Northwest,
Mexico Southwest,
Michigan,
Minnesota,
Mongolia,
Montana,
Morocco,
Myanmar,
Nebraska,
Nepal,
Netherlands,
Nevada,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Caucasus,
North Dakota,
North European Russi,
Northwest European R,
Northwest Territorie,
Norway,
Nova Scotia,
Ohio,
Ontario,
Oregon,
Pakistan,
Pennsylvania,
Poland,
Portugal,
Primorye,
Prince Edward I.,
Québec,
Rhode I.,
Romania,
Sakhalin,
Sardegna,
Saskatchewan,
Sicilia,
South Dakota,
South European Russi,
Spain,
Sweden,
Switzerland,
Tadzhikistan,
Transcaucasus,
Tunisia,
Turkey,
Tuva,
Ukraine,
Utah,
Uzbekistan,
Vermont,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yakutskiya,
Yemen,
Yugoslavia,
Yukon
Introduced into:
Maryland