Book  (Jan 2000)  Page(s) 227.  
 
Gunphoden Tree Peony. ex Japan [no date given]... pink

Website/Catalog  (1956)  Page(s) [1].  
 
Japanese Tree Peonies
Gumpoden (Temple adorned with many flowers) Large violet double...$6.00

Magazine  (17 Aug 1929)  Page(s) 132.  
 
Tree Paeonies in Japan.
The following are the best Japanese varieties of Pæonia Moutan:
Gunpo-den, of a colour difficult to describe, raised petals, double, the best in purple shades...