vegetation regions
Vegetation plays an essential role in maintaining biospheric equilibrium; it varies depending on climate and soil characteristics.
maquis 
Vast expanse of degenerated vegetation composed of shrubs with evergreen leaves; it is adapted to summer drought.
desert 
Hot region where aridity (less than 4 in of annual rainfall) is such that plant and animal life is almost nonexistent.
savanna 
Vast expanse of herbaceous plants, dominated by tall grasses and shrubs; it is typical of hot regions that have a rainy season.
tropical rain forest 
Dense forest whose biodiversity is among the richest; its growth is fostered by abundant and regular precipitation.
grassland 
Vast expanse of herbaceous plants, mostly grasses; virtually devoid of trees, these regions are characterized by relatively cold, dry winters.
temperate forest 
Forest composed mainly of deciduous trees, including oak, ash and beech.
boreal forest 
Vast expanse of forest composed mainly of conifers, although certain deciduous trees also grow here.
tundra 
Plant formation that grows in relatively arid regions; it includes mosses, lichens, grasses, bushes and dwarf trees.