Referendums related to the European Union by 51.9% to leave the European Union. Greenland, an autonomous territory of Denmark, voted to leave the EC in a referendum in 1982 by 53% of voters. In 1972, four countries held referendums on the subject of the 1973 enlargement of the European Communities. Denmark, Ireland, and the United Kingdom were admitted as members of the EC, acceding on 1 January 1973. Two referendums were held in EU countries to permit them to ratify the Single European Act. In 1994, four countries, and one dependency, held referendums on membership of the EU, resulting in the 1995 enlargement of the European
Greenland from Europe. There are no native or free-living reptiles or amphibians on the island. Phytogeographically, Greenland belongs to the Arctic province of the Circumboreal Region within the Boreal Kingdom. The island is sparsely populated in vegetation; plant life consists mainly of grassland and small bushes, which is regularly grazed by livestock. The most common tree native to Greenland is the European white birch ("Betula pubescens") along with gray-leaf willow ("Salix glauca"), rowans ("Sorbus aucuparia"), common junipers ("Juniperus communis") and other smaller trees, mainly willows. Greenland's flora comprises about 500 species of higher plants, i.e. flowering plants, ferns, horsetails and lycopodiophyta.