The flower head of a composite, similar to a Black-eyed Susan (Rudbeckia), but with a yellow head. The rays (petals) had dropped:
From a planted wildflower meadow – earlier in the season, this meadow was packed with a dozen different types of Rudbeckia. Now that fall has come, there are white asters blooming, crowded with feeding bees, Painted Ladies, Cabbage Whites, and Clouded Sulphurs. The Rudbeckia are mostly long past, with a few remnants, including this flower.