Ellen Powell Thompson

Ellen Louella (Nellie) Powell Thompson (1840–1911) was an American naturalist and botanist, and an active advocate for women's suffrage.

Life Ellen Louella (Nellie) Powell was born in Ohio to parents of English origin. Her siblings included John Wesley Powell, best known for explorations of the American West and leadership of the early US Geological Survey. Another brother was William P. Powell, superintendent of Washington D.C. public schools. She had several sisters, one of whom was the wife of Congressman John Davis of Kansas, and mother of the scientist Arthur Powell Davis.

In the mid-1850s, she attended Wheaton College in Wheaton, Illinois. She taught school from the age of 16.

On July 8, 1862 in Wheaton, Illinois, she married professor and geographer Almon Harris Thompson, a colleague and friend of her brother John. During her marriage, Thompson continued to work as a teacher, and assumed her husband's position as superintendent of schools when he joined the army. She spent her 1863 summer vacation at Cairo, Illinois, caring for sick and wounded soldiers from the American Civil War.

The Thompsons had no children.

Thompson died of heart failure, at home while "engaged in household duties", on March 12, 1911. She is buried in Arlington National Cemetery.

Powell family: Back row, left to right: Ellen Powell Thompson, William Bramwell Powell, William (Billy) P. Powell, Almon Harris Thompson. Front row: John Wesley Powell and Mary Powell Wheeler. Topeka, Kansas, circa 1900.

Botany Thompson joined John Wesley Powell's second Colorado River expedition during their 1872 winter camp near Kanab, Utah, serving as botanist. Her husband Almon Harris Thompson was second in command. She collected plants primarily in the Kanab area, although collecting excursions were also made through southern Utah and northern Arizona. She collected 385 specimens, 15 of which would become type specimens for new taxa.

Every three months, Thompson sent her collections of dried pressed plants to Dr Asa Gray at Harvard University. Many of these specimens reside at the Gray Herbarium, part of Harvard University Herbaria. Some were deposited in the United States National Herbarium in Washington D.C., and others in scattered herbaria across the country.

Thompson also liked to paint, and her home was decorated with many botanical illustrations. and again in 1897. She was also a founding member of the Equal Suffrage Association of the District of Columbia.

In 1900, Thompson was the chair of the national convention, which ended with a celebration of Susan Anthony's 80th birthday, and retirement from the Presidency of the National Association. Thompson was active in securing a gift of $200 for Anthony.