Ellsworth Paine Killip (September 2, 1890 – November 21, 1968) was a U.S. botanist.
[1] Killip specialized in the taxonomy of South American plants.
Killip joined the staff of the United States National Museum (USNM; now known as the Smithsonian Institution) in 1919 as an Aide in the Division of Plants.
In 1947, Killip was appointed Head Curator of the newly established Department of Botany, USNM, a position he retained until his retirement in 1950.
[2] In 1925, Killipia was a genus of flowering plants from Colombia and Ecuador, belonging to the family Melastomataceae, named after him.