Woolly-pod Milk-vetch (Astragalus purshii) forms low-growing mounds. I took this picture while lying on the ground. The individual flower blossoms are about an inch long. The seed pods are indeed very woolly looking. I'll have to take and post a photo of them next season.
Woolly-pod Milk-vetch, Stacker Butte Trailhead, Columbia Hills State Park, WA.
