You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Place University of Michigan Botanical Gardens. Dixboro Site, 4.5 mi. northeast of Ann Arbor, Southwest corner of Osgood Woods at entrance to garden trails. Remove constraint Place: University of Michigan Botanical Gardens. Dixboro Site, 4.5 mi. northeast of Ann Arbor, Southwest corner of Osgood Woods at entrance to garden trails.