This is a species of Crab Spider. I've seen them in the past at camp, but most of them were white with red stripes/spots on the body. Don't know if this is a different species, as they have the ability to change color, depending on the flower. They can be yellow, white, or green. There were two Crab Spiders on this one Lupine in the meadow. This is the larger one. The other was substantially smaller, but don't know if it was just a young one, or a different species.