 <unk> pine dominates in cold , dry areas from 5 @,@ 200 feet ( 1 @,@ 600 m ) to 9 @,@ 200 feet ( 2 @,@ 800 m ) . The understory in lodgepole pine forests can be sparse but includes grasses , forbs , <unk> , and grouse <unk> , although fires in these forests are typically lethal to trees and <unk> alike . At the highest elevations , forests consist of subalpine fir alongside <unk> pine and Engelmann spruce . Grasses and forbs tolerant to freezing throughout the growing season occupy the understory . 
