Really lovely! Yellow background is also interesting contrast.
Concerning identification, when I have a nice macro of a flower that I don't recognize, I usually remember to also photograph the whole plant, so that I get a view of leaves (size? shape?), pattern of leaves on stem (opposite? alternate?), position of flower on stem (terminal? side shoots?) - and take a note of what type of habitat it comes from (limestone glade? deep soil prairie? woodland edge? streamside?). Then I have enough information to consult regional or local wildflower identification websites. I also bought a basic book on wildflowers of Missouri, not comprehensive, but has a handy pictorial glossary of botanical terms.
