You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place About 5 mi. E. of Ciudad Guerrero on Rt. 16. Roadside near corn fields on hilltop. Remove constraint Place: About 5 mi. E. of Ciudad Guerrero on Rt. 16. Roadside near corn fields on hilltop. Place Chihuahua Remove constraint Place: Chihuahua Place Mexico Remove constraint Place: Mexico Topic Magnoliopsida Remove constraint Topic: Magnoliopsida Topic Plantae Remove constraint Topic: Plantae