The vegetation of Pirin is vertically divided into five distinct elevation zones: Mediterranean, deciduous, coniferous, that combined form the tree line reaching approximately altitude of 2,000 m, shrubs forming the subalpine line up to 2,500 m and alpine meadows, also known as the alpine line above 2,500 m. The Mediterranean zone is dominated, among other, by pubescent oak (Quercus pubescens) and Oriental Hornbeam (Carpinus orientalis), the deciduous zone by European oak (Quercus robur) and European beech (Fagus sylvatica), and the coniferous — by Macedonian pine (Pinus peuce), Bosnian pine (Pinus heldreichii) and Scots pine (Pinus sylvestris). The subalpine line is mainly covered with dwarf mountain pine (Pinus mugo) and common juniper (Juniperus communis). The alpine line is covered with grass, moss, lichen and abundant in bilberries and rare flowers such as the edelweiss (Leontopodium alpinum). Pirin is home to Bulgaria's oldest tree, the 1300-year Baikushev's pine — a Bosnian pine that is a contemporary of the foundation of the Bulgarian state in 681 AD.