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

Article (website)  (1998)  Page(s) 3.  Includes photo(s).
 
'Goshozakura' (right), bred by Tanaka Shinzaemon, introduced in "Paeonia Moutan - A Collection of 50 Select Varieties" (a collection of exemplary illustrations of 50 representative peonies cultivated for the export market), published by the Yokohama Ije Co. (1915).

Website/Catalog  (1956)  Page(s) [1].  
 
Japanese Tree Peonies
Gosho Zakura (Cherries of the Imperial Palace) Giant cherry double...$6.00

Website/Catalog  (1933)  Page(s) [4].  
 
Tree Peonies - The King of Flowers
Gosho-Kazura—Single, shell pink... $5.00