Mary Emily Eaton (1873-1961) was born on 27 November 1873 in Coleford, Gloucestershire, England. She is best known as a botanical artist for her illustrations in The Cactaceae (Britton and Rose, 1919-1923) for which she was the principal illustrator.
She was employed by the New York Botanical Garden from about 1911 to 1932. Her illustrations are housed at the National Geographic Magazine and in the Contributions from the U.S. National Herbarium. These drawings of various opuntiads are from The Cactaceae, v1. Full-size drawings are available at Plant Illustrations.