You searched for: Place University of Michigan Botanical Gardens. Dixboro Site, 4.5 mi. northeast of Ann Arbor, southwest corner of Osgood Woods. Remove constraint Place: University of Michigan Botanical Gardens. Dixboro Site, 4.5 mi. northeast of Ann Arbor, southwest corner of Osgood Woods. Place Washtenaw Remove constraint Place: Washtenaw Topic Asterales Remove constraint Topic: Asterales Topic Cirsium Remove constraint Topic: Cirsium