Vegetation in the Trout Creek Mountains is dominated by big sagebrush and desert grasses . Other common shrubs include bitterbrush , snowberry , and Ceanothus . It are also patches of mountain mahogany in some areas . Common grass species include Idaho fescue , bluebunch wheatgrass , cheatgrass , western needlegrass , Sandberg 's bluegrass , Thurber 's needlegrass , and bottlebrush squirreltail , as well as basin wildrye in some well @-@ drained areas .