Brown-eyed Susan

It's wild that each of these is its own little flower (known as a floret)

One or two flower heads measuring 0.5–1.5 in (1–4 cm) appear at the end of individual upper stems. Each flower head has six to twelve bright yellow ray florets surrounding a purplish brown flattened cone of disk florets. The flower heads are abundant and showy, although they have little or no scent.