You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Sierra Madre Occidental, about 50 km west of C. Durango, near the highway to Mazatlan Remove constraint Place: Sierra Madre Occidental, about 50 km west of C. Durango, near the highway to Mazatlan