Ellen Willmott was responsible for The Genus Rosa, a beautiful work which featured different species of roses. She was also involved in another very important monograph, The Genus Iris by W.R. Dykes. She contributed much of the preliminary work with Sir Michael Foster, a keen amateur grower of irises. On Foster's death, his note books were passed to Miss Willmott, who collaborated on the book with W.R. Dykes, then a modern languages master at Charterhouse School. The illustrations were by F.H. Round, who was a drawing master at the school, and thus conveniently placed for receiving specimens. The work, published by the Cambridge University Press in 1913, contained 47 colorplates by Round. In many respects, the work of Miss Willmott and the Dykes marked the end of the tradition of great flower books that had continued, more or less without break, since the seventeenth century.