They make the trees of the eastern forests look stunted.

They are excelled in size only by the mammoth redwood trees of northern California and the giant Sequoias of the southern Sierras.
[Illustration: THE SEQUOIAS OF CALIFORNIA] Differences of climate have largely influenced tree growth and types in this country.

The distribution of tree families is changing all the time.

It shifts just as the climate and other conditions change.

Trees constantly strive among themselves for control of different localities.