You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Place Coahuila Remove constraint Place: Coahuila Place El Fénix; 14 mi SW of Piedras Negras toward Nava. Remove constraint Place: El Fénix; 14 mi SW of Piedras Negras toward Nava. Topic Magnoliopsida Remove constraint Topic: Magnoliopsida Topic Poaceae Remove constraint Topic: Poaceae Topic Poales Remove constraint Topic: Poales