Book  (1907)  Page(s) 163.  
 
1857. OPITER; P.
(1) 1899, Shady Hill Nursery Cat., p. 144.

Website/Catalog  (1900)  Page(s) 144.  
 
List of Single Pæonies.
Opiter. Deep purple crimson.

Website/Catalog  (1890)  
 
Single Herbaceous Pæpnies.
Opiter, deep purple-crimson. [K}