You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Mexico Remove constraint Place: Mexico Place Road to Calvillo, 19-20 miles west of Aguascalientes Remove constraint Place: Road to Calvillo, 19-20 miles west of Aguascalientes Topic Asterales Remove constraint Topic: Asterales Topic Magnoliopsida Remove constraint Topic: Magnoliopsida Topic Vernonia Remove constraint Topic: Vernonia