You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Place Willow Island in the Kankakee River, just NW of Altorf, ca 7 mi NW of Kankakee. Remove constraint Place: Willow Island in the Kankakee River, just NW of Altorf, ca 7 mi NW of Kankakee.