The Flora of Lithuania is estimated to comprise about 10,600 species. About 1,350 of these are vascular plants; about 335 are bryophytes; and about 2,000 are algae. Lichens are represented by about 500 species, and fungi by about 6,400 species. About 550 of these species are considered extinct or threatened. Protected areas now cover more than 12% of the territory of Lithuania.
Lithuania lies in both in the boreal and the broadleaved (angiosperm) forest belts. A variety of species are therefore found within its relatively small territory, including species characteristic of the southern taiga. The occurrence of the hornbeam species Carpinus betulus marks the border between the predominantly broadleaved zone in the south and the coniferous zone in the north.