This Scenery Pics wallpaper contains
beech, beech tree, ponderosa, ponderosa pine, western yellow pine, bull pine, pinus ponderosa, sitka spruce, and picea sitchensis.
There might also be
birch, birch tree, american white birch, paper birch, paperbark birch, canoe birch, betula cordifolia, betula papyrifera, and douglas fir.