You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Place Vicinity of Cerro Zempoaltepetl. Near Piksa'ah (Piedra Redonda) about eight kilometers east of summit, on trail to Zacatepec Mixes Remove constraint Place: Vicinity of Cerro Zempoaltepetl. Near Piksa'ah (Piedra Redonda) about eight kilometers east of summit, on trail to Zacatepec Mixes