In the Central Rocky Mountains, trees and shrubs make their home in a patchwork of forests and meadows between 5500 ft. and 11500 ft. (1650 m.-3450 m.). Different ecosystems in the park support particular species depending on elevation, precipitation, and aspect (the steepness and direction of the slope). In the harsh mountain environment only evergreen trees, a few hardy deciduous trees and strong adaptive shrubs can thrive.