You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Place Houghton Remove constraint Place: Houghton Place Portage Canal, just west of Hancock/Houghton lift bridge, north shore. Porvoo Park. Remove constraint Place: Portage Canal, just west of Hancock/Houghton lift bridge, north shore. Porvoo Park. Topic Haloragaceae Remove constraint Topic: Haloragaceae Topic Myriophyllum Remove constraint Topic: Myriophyllum