Website/Catalog  (1866)  Page(s) 21.  
 
74. Incomparable a middle-sized, purplish red, a very showy rose.  Perpetual.

Website/Catalog  (1862)  Page(s) 14.  
 
Sheppardii HP. Red.

Website/Catalog  (1861)  
 
Sheppards  Incomparable

Website/Catalog  (1851)  Page(s) 64.  
 
Shepherd's Incomparable. Purple

Website/Catalog  (1851)  
 
Incomparable. (12. Evergreen and Perpetual)

Website/Catalog  (1829)  Page(s) 33.  
 
50. Incomparable 6  purplish rose
[It may be possible that Shepherd imported this 'Incomparable']