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Africa Northern Africa Algeria Libya Morocco Tunisia Asia-Temperate Caucasus North Caucasus Transcaucasus Western Asia East Aegean Is. Turkey Europe Eastern Europe Baltic States Belarus Central European Russia East European Russia Krym North European Russia Northwest European Russia South European Russia Ukraine Middle Europe Austria Belgium Czechoslovakia Germany Hungary Netherlands Poland Switzerland Northern Europe Denmark Finland Great Britain Iceland Ireland Norway Sweden Southeastern Europe Albania Bulgaria Greece Italy Romania Sicilia Turkey-in-Europe Yugoslavia Southwestern Europe France Portugal Sardegna Spain Northern America Subarctic America Greenland Introduced into Antarctic Subantarctic Islands Falkland Is. Asia-Temperate Russian Far East Primorye Siberia West Siberia Asia-Tropical Indian Subcontinent Assam Australasia Australia Tasmania Europe Southwestern Europe Corse Northern America Eastern Canada New Brunswick Newfoundland Nova Scotia Ontario Prince Edward I. Québec North-Central U.S.A. Illinois Iowa Minnesota Missouri South Dakota Wisconsin Northeastern U.S.A. Connecticut Indiana Maine Masachusettes Michigan New Hampshire New Jersey New York Ohio Pennsylvania Rhode I. Vermont West Virginia Northwestern U.S.A. Colorado Idaho Montana Oregon Washington Wyoming Southeastern U.S.A. Alabama Kentucky Maryland North Carolina Tennessee Virginia Western Canada Alberta British Columbia Manitoba Saskatchewan Southern America Southern South America Argentina South Chile Central Chile South