You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Place Houghton Lake Wildlife Research Area (Porter Ranch) ca. 6 km. sw of Houghton Lake T22N, R5W. Remove constraint Place: Houghton Lake Wildlife Research Area (Porter Ranch) ca. 6 km. sw of Houghton Lake T22N, R5W. Topic Potamogeton Remove constraint Topic: Potamogeton