Book  (Dec 2000)  Page(s) 107.  
 
Penelope Mayo
Hybrid Perpetual
Davis U.S.A. ? 1878

Book  (1936)  Page(s) 467.  
 
Mayo, Penelope (HP) Davis 1878; Alfred Colomb X ? ; glossy carmine, large, double, fine form, fragrance 8/10, floriferous, growth 7/10 = Duch. de Caylus.

Website/Catalog  (1894)  Page(s) 179.  
 
Hybrid Perpetual Roses.
Penelope Mayo​​​​​​​ ....a thorough perpetual. 

Magazine  (1889)  Page(s) 283.  
 
The following Roses bracketed together have been regarded as synonymous, according to the rule adopted by the National Rose Society; and the name standing first in each case, being believed to be the original name, is considered for the purpose of the preceding Digest as the ruling name of the Rose.
(Duchesse de Caylus
(Penelope Mayo

Website/Catalog  (1885)  Page(s) 73.  
 
Hybrid Perpetual Roses.
Penelope Mayo  Brilliant carmine-red, large, fine flower of great substance, perfect in form, with a strong, robust constitution.

Book  (1882)  Page(s) 30.  
 
Pénélope Mayo... Variété à cultiver pour les Expositions de fleurs. Hybride Perpétuel. Davis. 1878 Rouge carmin. Fleur grande. Plante vigoureuse.

Magazine  (Feb 1879)  Page(s) 33.  
 
Les Roses Nouvelles .... M. Charles Turner, à Slough, Angleterre.
Penelope Mayo (Davis). — Très-remontant, vigoureux, grandes fleurs, rouge carmin.

Magazine  (11 Jul 1878)  Page(s) 29.  
 
Several new Roses have been exhibited this year, some of them for the first time, in a manner that affords evidence of their intrinsic merit. There were a good sprinkling of excellent blooms of Penelope Mayo at the National, and magnificent examples of it at South Kensington on the 3rd inst., where it was certificated. It is questionable if a finer trio of blooms than those referred to have been staged at any exhibition this year. Penelope Mayo is an improving and very fine Rose.