Europe, Ecosystems of (a) (d) (b) (e) (c) (f) 345 Figure Biome maps of Europe derived from the interactive CD-ROM featuring the Map of the Natural Vegetation of Europe (Bohn et al., 2000–2004) using the following key: (a) Polar Desert & Tundra biomes (Units A and B as defined and described in Bohn et al (2000–2004)); (b): Boreal Forest biome (Units C1–2, D1–4, D5.1–5.2); (c) Temperate Deciduous Forest biome (Units D3, D5.3, F, G, K, L; hemiboreal forests units and the montane needle-wood forests of the Alps, Carpathians, and the Caucasus are included as well); (d): Mediterranean biome (Units J); (e) Steppe biome (Units M); and (f) Continental Desert biome (Unit D) The azonal vegetation (P, R, S, T, and U) are not shown The color codes follow strictly those of Bohn et al (2000–2004)