I teach a "Prairie Ecosystems & Restoration" introductory course for Marian University and University of Wisconsin-FDL in Fond du Lac, WI. We use your book, The Ecology and Management of Prairies in the Central U.S. as our text. We follow your blog and the students really enjoy it. Sometimes I make it assigned reading!
I polled the class today with your first plant name question. Here are the results: (19 students)
3 - blue scorpion grass, 3 - unicorn plant, 7 - duckbill hairycress, 6 - spider antelope horns