The Black-eyed Susan, (Rudbeckia hirta), is one of the most common wildflowers in the US. The plants often grow up to 3 ft tall with leaves up to 6 in long. This photo was taken on a Thacher Nature Center trail.
These plants are biennial, living only two years. They flower in mid summer to mid October.
In the close-up of the flower, you can see the bristly hairs that cover the plant’s stem and the disk flowers that form the brown central cone.