identification - What is this shrub with clumps of small white

Last year I started redoing all the front landscaping at my house. At the time, I didn't know this bush flowered, but I moved it to the back to let it grow. What is it? click on picture for full size

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identification - What is this shrub in Colorado with white flowers and closely spaced small ovate leaves? - Gardening & Landscaping Stack Exchange

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