Mary Day

Mary Anna Day (1852–1924) was an American botanist and librarian at the Gray Herbarium of Harvard University from 1893 to 1924. She edited and compiled the Card Index of New Genera, Species, and Varieties of American Plants, a quarterly publication that was considered "indispensable" to botanists. By 1923, the publication contained about 170,000 cards. Her work involved checking bibliographical references, proofreading manuscripts, preparing indexes and statistics on the library and herbarium collections." Her publications also include a "List of local floras of New England" and "Herbariums of New England" for the New England Botanical Club.

She was born on October 12, 1852 in Nelson, New Hampshire, and worked as a public school teacher in Massachusetts and public librarian in Clinton, Massachusetts, before becoming librarian at the Gray Herbarium. She died January 27, 1924 in Cambridge, Massachusetts.