A description of "De Fleury" is found in "Old Garden Roses" by Edward A. Bunyard, London 1936 (p. 77):

"DE FLEURY (foliacea) Redouté

White semi-double, marked ring of anthers, style a button. Pedicel hairy, hip smooth. Calyx very long and foliaceous, which distinguishes it from the Alba semi-plena"