Geography
Answer
The vegetation in the Mediterranean region is of deciduous type. It is adapted to withstand a long period of summer drought. So the trees in this region have long roots and thick barks to retain moisture in the dry summer months. Short stature, moisture retentive trees grow here specially citrus fruits.
The dominant trees of Mediterranean region of Europe include oak, laurel, cork, oleander, beech and ash. Olive is the most common tree.
The North American Mediterranean region has dominant species of chestnut, maple and hemlock. Redwood trees of California forests are famous.
Towards the Polar regions and in highlands, coniferous evergreen trees are found. Cedar, pine, fir and cypress are the common varieties.