You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Place North America Remove constraint Place: North America Place Rensselaer Remove constraint Place: Rensselaer Place Troy, River Hudson [Coordinates are for the River shore at the 19th St. bridge.] Remove constraint Place: Troy, River Hudson [Coordinates are for the River shore at the 19th St. bridge.] Place USA Remove constraint Place: USA Topic Potamogeton Remove constraint Topic: Potamogeton