Mary Agnes Chase, Botanist, by Unknown, c. 1960, Smithsonian Archives - History Div, Mary Agnes Chase (1869-1963), Honorary Curator of the United States National Herbarium at the Smithsonian Institution and Botanist at the United States Department of Agriculture, seated at a desk with herbarium sheets. Chase specialized in the study of grasses and conducted extensive field work in South America. Chase is sitting at a work table comparing grass specimens, c. 1960..