Mary Emily Eaton (27 November 1873 – 4 August 1961) was an English botanical artist best known for illustrating Britton & Rose's The Cactaceae, published between 1919 and 1923.

[1][3] During her two-years stay, she began painting detailed studies of butterflies and moths.

[1][3] Among other duties, she was the principal illustrator for the Botanical Garden's journal Addisonia, painting over three-quarters of the 800 plates.

[3] In 1932, due to the Great Depression, Eaton lost her position at the Botanic Garden, after which she struggled to find enough work in America.

[1] Over six hundred of her watercolours are part of the permanent collections of the National Geographic Society, The New York Botanical Garden[5][4] and the Smithsonian Institution.