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 Trap Rock River, near Lake Linden, Remove constraint Place: Trap Rock River, near Lake Linden, Topic Agrostis Remove constraint Topic: Agrostis Topic Poaceae Remove constraint Topic: Poaceae Topic Poales Remove constraint Topic: Poales