You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Illinois Remove constraint Place: Illinois Place Windfall Hill Prairie Nature Preserve Windfall Prairie Seep, West facing bank of the Middle Fork of the Vermilion River. Danville NW 7.5 minute topo. Remove constraint Place: Windfall Hill Prairie Nature Preserve Windfall Prairie Seep, West facing bank of the Middle Fork of the Vermilion River. Danville NW 7.5 minute topo. Topic Plantae Remove constraint Topic: Plantae Topic Poales Remove constraint Topic: Poales Topic Schoenoplectus Remove constraint Topic: Schoenoplectus