Book  (1956)  Page(s) 161.  
 
It was here that he developed the two roses, Agnes Rose, named for Mrs. Saunders, and Mary Arnott, named for the wife of his friend, Dr. H. Arnott.

Book  (1922)  Page(s) 41-43.  
 
by Isabella Preston
"Mary Arnott"—rugosa x Prince Camille de Rohann, is brilliant crimson in color, semi-double and fragrant.

Magazine  (1915)  Page(s) 398-403.  
 
PLANT BREEDING IN CANADA by W. T. MACOUN
Two worthy varieties of roses originated at Ottawa by the late Dr. Wm. Saunders are Mary Arnott and Agnes, the former a brilliant crimson scarlet cross between Rosa rugosa and Prince Camille de Rohan, the latter, pale yellow with a salmon tinge, a cross between Rosa rugosa and Persian Yellow.

(1913)  Page(s) 107, 110.  
 
p. 107
Mary Arnott (carmine-red, semi-double)
p. 110 
33. Mary Arnott - about 1897 - Carmine-red - Specially free bloomer; flowers in fine clusters.

Book  (1899)  Page(s) 61.  
 
20.- R. Mary Arnott. (R. rugosa x Prince Camille de Rohan). Planted, 1897. Half hardy.