Black-eyed Susan (Rudbeckia hirta) is, perhaps, our best-known prairie flower. Native to North America, its bright yellow flowers bloom early in the summer and can continue throughout the season.
A related species of Black-eyed Susan, Rudbeckia fulgida, is also native to our area (and much of the eastern US). It became a popular garden flower through an interesting path. Rather than being directly adopted from the wild, the most popular horticultural variety "Goldsturm" crossed the Atlantic twice. A German horticulturalist found an attractive variant in a Czech garden and developed it for commercial purposes in Germany. From Europe, it returned to US gardens.
I'm not absolutely sure which Black-eyed Susan is in the photo.
I teach economics at Kalamazoo College. My wife is also an economist. We were on sabbatical in Europe for the 2014-15 academic year. (Salamanca, Spain, followed by Oxford, UK.) We were in Uruguay for the 2006-7 academic year.