You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Ann Arbor, Remove constraint Place: Ann Arbor, Place Michigan Remove constraint Place: Michigan Place North America Remove constraint Place: North America Place Washtenaw Remove constraint Place: Washtenaw Topic Asteraceae Remove constraint Topic: Asteraceae Topic Helianthus Remove constraint Topic: Helianthus Topic Magnoliopsida Remove constraint Topic: Magnoliopsida