It's easy to forget that grasses have flowers, because the blooms are so tiny. I believe this is Indian grass (Sorghastrum nutans) but there are hundreds of grasses in Wisconsin, and I can't guarantee the identity. It's an attractive plant and one component of the traditional tall-grass prairie.
Photographed by my wife a couple days ago during a hike on the grounds of the Holy Wisdom Monastery in Middleton, Wisconsin.
"Holy Wisdom Monastery is home to a diverse ecosystem spread across more than 130 acres of restored prairie, woodlands, wetlands, gardens, orchards and more. Nurturing partnerships with Dane County, Madison Community Foundation and others who value caring for the earth has always been important to us.Here's one more photo from that hike: (Tiger Swallowtail on Bull Thistle)
In September 2012, we acquired a 53-acre cornfield which we are committed to integrating and restoring to native prairie and oak savanna to help improve the water quality in Lake Mendota. In March 2015, we successfully met our goal of raising $1.9 million to cover the acquisition and initial management costs..."