They also occur often in the mountain ranges of western North America.

Their breeding habitat is open areas in western North America.

It has two living representatives breeding in western North America.

There are 16 to 20 species, all native to western North America.

However, it has never been found in western North America.

The ten species are all shrubs native to western North America.

The species is native to central and western North America.

The high mountain forests of western North America need fire.

They are common during the summer months across much of western North America.

He discovered and named many fossils found in western North America.