You searched for: Collection University of Michigan Herbarium Catalog Collection Remove constraint Collection: University of Michigan Herbarium Catalog Collection Place Caprock area on north bank of Canadian R., 27 mi. S. of Perryton on Texas 70. Remove constraint Place: Caprock area on north bank of Canadian R., 27 mi. S. of Perryton on Texas 70. Topic Euphorbia Remove constraint Topic: Euphorbia