You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Barranca of Río Verde, ca. 20 miles north of Tepatitlán on road to Yahualica. Remove constraint Place: Barranca of Río Verde, ca. 20 miles north of Tepatitlán on road to Yahualica. Topic Selaginellaceae Remove constraint Topic: Selaginellaceae