Native to:
Alabama,
Alaska,
Alberta,
Aleutian Is.,
Altay,
Amur,
Arizona,
Arkansas,
British Columbia,
Buryatiya,
California,
China North-Central,
Chita,
Colorado,
Connecticut,
Delaware,
Denmark,
District of Columbia,
Finland,
Georgia,
Great Britain,
Greenland,
Iceland,
Idaho,
Illinois,
Indiana,
Inner Mongolia,
Iowa,
Ireland,
Irkutsk,
Japan,
Kamchatka,
Kansas,
Kazakhstan,
Kentucky,
Khabarovsk,
Korea,
Krasnoyarsk,
Kuril Is.,
Labrador,
Magadan,
Maine,
Manitoba,
Maryland,
Massachusetts,
Mexico Northeast,
Michigan,
Minnesota,
Mississippi,
Missouri,
Mongolia,
Montana,
Nebraska,
Nevada,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Carolina,
North Dakota,
North European Russi,
Northwest Territorie,
Norway,
Nova Scotia,
Nunavut,
Ohio,
Ontario,
Oregon,
Pennsylvania,
Primorye,
Québec,
Sakhalin,
Saskatchewan,
South Carolina,
South Dakota,
Svalbard,
Sweden,
Tennessee,
Tuva,
Utah,
Vermont,
Virginia,
Washington,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yakutskiya,
Yukon
Introduced into:
Czechoslovakia