Physocarpus opulifolius/monogynus (Ninebark)

I have to go back and re-examine these plants. P. opulifolius has wedge-shaped leaves, P.monogynus has truncate leaves, and the two hybridize. All Ninebarks have earned their name because of their peeling bark. The pink flowered plant in these photos is near the Trailhead for the Loop Trail, while the white flowered ones are on the Waterfall Trail.

 

 

 

This is probably P. opulifolius, but I am not 100% positive. Maybe 99.9%.