You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Iowa Remove constraint Place: Iowa Place Willow Slough Public Hunting Area, 3 miles south of Henderson. Remove constraint Place: Willow Slough Public Hunting Area, 3 miles south of Henderson. Topic Cyperaceae Remove constraint Topic: Cyperaceae Topic Magnoliopsida Remove constraint Topic: Magnoliopsida Topic Poales Remove constraint Topic: Poales