Astragalus lentiginosus
A widespread low-ish elevation species found in much of the western United States. The USDA PLANTS Database lists a staggering 35 varieties. In gestalt, this species is rather similar to Astragalus hallii.
Plant habit west of Santa Fe, 17 May 2008.
Flowers, west of Santa Fe, 17 May 2008.
A cauline leaf, W of Santa Fe, 17 May 2008.
More flowers, 17 May 2008.