Looks like ocean spray, Holodiscus discolor. Native to much of the PNW. Occurs in various parts of western MT.

Gardengal, I so appreciate your help! I am going to be posting another one soon, so please stick around. :)

"Holodiscus contains two species complexes: the argenteus and the discolor complexes (R. A. Lis 1990). The discolor complex comprises H. discolor and H. microphyllus and ranges from British Columbia and Montana through the western United States and south through Mexico along the Sierra Madre Occidental and Oriental, with the southern terminus near the Valley of Mexico. The argenteus complex comprises H. argenteus (Linnaeus f.) Maximowicz, H. fissus (Lindley) C. K. Schneider, and H. orizabae F. A. Ley and ranges from the Trans-Mexican Volcanic Belt south to Colombia and Venezuela.

A number of species and varieties have been described from the western United States that appear locally unique, and many names have been applied at the species and varietal levels. The leaves have provided the primary characters for circumscribing taxa in the genus, as the flowers and inflorescences show a narrow range of variation. Holodiscus can exhibit phenotypic plasticity in leaf morphology, particularly in response to changes in relative amounts of moisture and light"

http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=115616