You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Place Along highway US-31 and overflow pond of Muskegon River, north of Muskegon. Remove constraint Place: Along highway US-31 and overflow pond of Muskegon River, north of Muskegon. Place Michigan Remove constraint Place: Michigan Place North America Remove constraint Place: North America Topic Alismatales Remove constraint Topic: Alismatales Topic Magnoliopsida Remove constraint Topic: Magnoliopsida Topic Wolffia Remove constraint Topic: Wolffia