Rock Spirea
Holodiscus dumosus

Family: Rose (Rosaceae)
AKA: Mountain Spray, Ocean Spray, Creambush
Photo taken on: July 18, 2011
Location: Taylor Canyon, GV, CO
Life Zones: Foothills to montane
Habitat: Steep, sunny, rocky slopes

Grows to 8 feet with dark red twigs and masses of tiny flowers. 

Flora of North America reference.