You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Place Along a 50 ft. stretch of a footpath beside the River Rouge at the SW end of the ice-skating area north of Joy Rd. Remove constraint Place: Along a 50 ft. stretch of a footpath beside the River Rouge at the SW end of the ice-skating area north of Joy Rd. Topic Polygonaceae Remove constraint Topic: Polygonaceae