Getting back to plants in my yard, I was out and about Saturday taking pictures. Mostly of bees, and out of focus hummingbirds, when I noticed a wonderful swatch of yellow fluttering in.
I think this is an Orange Sulphur. There was a fair amount of black fringe on the inside of the wings. You can sort of make it out here. There is also a brighter patch of yellow on the main wings that is probably orange when viewing them open. If it's not that species than it's likely just a Clouded Sulphur.
I love the green eyes to this group of butterflies. They most use Legumes as a host plant with emphases on the flowers and seed pods. According to BugGuide Alfalfa and Clovers also work.