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This is (maybe) Arrowleaf Violet (Viola sagittata). If that's wrong, please let me know. It's very small, with flowers approximately 1/2 inch or 1 cm across. They have a lovely sparkly velvet texture that's quite remarkable.
I think this might be a wild violet. Everglades National Park, Florida (USA)
yellow coneflower (Ratibida pinnata)