Native to:
Alabama,
Alaska,
Albania,
Alberta,
Aleutian Is.,
Arizona,
Arkansas,
Austria,
British Columbia,
Bulgaria,
California,
Colombia,
Colorado,
Connecticut,
Costa Rica,
Czechoslovakia,
Delaware,
Denmark,
District of Columbia,
East Himalaya,
Finland,
France,
Georgia,
Germany,
Greece,
Guatemala,
Idaho,
Indiana,
Iowa,
Italy,
Japan,
Kamchatka,
Kansas,
Kentucky,
Kirgizstan,
Korea,
Kuril Is.,
Labrador,
Maine,
Manchuria,
Maryland,
Massachusetts,
Mexico Gulf,
Mexico Northwest,
Mexico Southeast,
Michigan,
Minnesota,
Missouri,
Montana,
Nevada,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Carolina,
North Dakota,
Nova Scotia,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pennsylvania,
Poland,
Portugal,
Prince Edward I.,
Québec,
Rhode I.,
Romania,
Sakhalin,
Saskatchewan,
South Carolina,
Spain,
Sweden,
Switzerland,
Tennessee,
Ukraine,
Utah,
Venezuela,
Vermont,
Virginia,
Washington,
West Virginia,
Wisconsin,
Wyoming,
Yugoslavia
Introduced into:
Great Britain,
Réunion