 <unk> typically dominates drier , non @-@ forested areas at lower elevations . Species that commonly occur with sagebrush include <unk> <unk> , wild onion , milk <unk> , bluebunch wheatgrass , <unk> , gray <unk> , green <unk> , and others . In riparian areas below 5 @,@ 500 feet ( 1 @,@ 700 m ) , trees such as black cottonwood , <unk> cottonwood , <unk> alder , water birch , and mountain maple grow with shrubs including <unk> and willows . <unk> areas in largely <unk> habitats such as sagebrush steppe primarily consist of willows along with <unk> alder , <unk> , mountain maple , shrubby <unk> , <unk> , <unk> , and grasses . 
