You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place About 2.2 mi NE of Hwy 15 (toward a microwave tower), about 6.9 mi SE of Ciudad Obregon Remove constraint Place: About 2.2 mi NE of Hwy 15 (toward a microwave tower), about 6.9 mi SE of Ciudad Obregon Place Mexico Remove constraint Place: Mexico Place Sonora Remove constraint Place: Sonora Topic Euphorbia Remove constraint Topic: Euphorbia