Bessie Niemeyer Marshall was an American botanical illustrator known for her watercolor paintings of the wildflowers of Lee Memorial Park.

Her artwork documented the variety of plant species being preserved in Lee Memorial Park, a Works Progress Administration-funded wildflower and bird sanctuary in Petersburg, Virginia.

(Women's and Professional Division) funds, authorized the creation of a 25-acre wildflower sanctuary in Lee Memorial Park.

[4] Under the direction of Petersburg Garden Club member Mary Donald Claiborne Holden, African American women labored on the project through 1940, clearing ravines, building ten miles of paths, and planting 365,00 plants, including 8,000 trees and 37,000 shrubs and more than one million honeysuckle roots to prevent erosion.

[4][5] In 1937, Holden hired Marshall to paint watercolors of the dried and pressed plant specimens of Lee Park flora.