This individual may be closer to the typical western color of the species. This was growing in a planted prairie here in Lenawee County. That's a very bad idea. The endangered Karner's blue butterfly raises its offspring on Lupinus perennis. If other species of lupine are present, they will lay eggs on those, but the larvae don't survive. This has contributed to the decline of the butterflies.
An aside, nothing to do with wildflowers. Today is not my birthday. I once traveled from east to west across the international dateline. I never crossed back. I'm not sure whether that makes me a day older, or a day younger. But I am sure it is very unfair that they wouldn't let me eat cake yesterday!