I think Rudbeckia fulgida, specifically. I also think the one with the mahogany spot on the petals is simply a variant form of the same plant. They are mixed growing out in the pasture. I hope there's enough info in the photo.

Rudbeckia hirta var. pulcherrima I would say ..

notice the hirsute pubescence on the leaves and stem

the ligules of the ray flowers are yellow and can have extensive brown coloration or very little

http://www.sbs.utexas.edu/bio4...

http://www.sbs.utexas.edu/bio4...

http://www.wildflower.org/gall...

http://wisflora.herbarium.wisc...

@JRsbugs
Thank you. I think that works better than fulgida. I'll leave it a bit in case someone else disagrees, then I'm going to mark this as identified.

I concur, Rudbackia hirta. I have an entire field of them.Yes, the mahogany is just a variant. I get many variations.