Puffy white flower shrub on Newberry Crater and Cascade mountains

Puffy; creamy; white; flower; flowering; bush; ground cover; shrub; Newberry; Crater; caldera; National; volcanic; monument; stratovolcano; Cascade; mountains; Mount Bachelor; Three Sisters; forest; mountain; pine; trees; wild; wilderness; butterflies; Oregon; perennial; plant; Spiraea betulifolia; birchleaf spirea