White flowers, blue skies.

We went out disc golfing yesterday (well, technically I didn't play because I was sore from too much discing the rest of the week). I brought my camera, but didn't pull it out until I saw these flowers:



I'd love to know what they are. They were growing on big 6-8' bushes in a large open area. If they're non-invasive, they'd be a pretty plant to add to the yard.