Website/Catalog  (1912)  Page(s) 12.  
 
Kelway's Peonies.
Kelway, of England, has produced some very fine varieties, such as Baroness Schroeder, James Kelway, Lady Alexandra Duff, and various other sorts.
Emperor of Russia. A magnificent deep purple-crimson; very handsome; early flowering. $1.00.

Book  (1907)  Page(s) 38.  
 
Emperor of Russia. Kelway, 1890. Large, deep purple crimson.
 

Website/Catalog  (1903)  Page(s) 3.  
 
KELWAY’S LATEST INTRODUCTIONS OF DOUBLE HERBACEOUS PAEONIES
Emperor of Russia, deep purple crimson. ...$ 2.00 .