Book  (Jan 2000)  Page(s) 227.  
 
Gessekai Tree Peony. ex Japan [no date given]. Also sold as 'Kingdom of the Moon'... white

Magazine  (Dec 1963)  Page(s) 11.  
 
Tree Peonies 
Leo J. Armatys, Central City, Nebraska
Our Martyred President:
All too seldom does a man as John F. Kennedy pass our way. His classic grace in action was apparent at all levels. The world lost an illustrious leader. Gardeners lost a friend. He found time to transform the White House garden from a patch of neglected roses into a sanctuary of beauty. Anchored by a small group of tree peonies including Gessekai, the new White House garden was liberally spiced with Saunders hybrids. It may grow in beauty as the plantings mature but somehow it will never be the same.

Website/Catalog  (1956)  Page(s) [1].  
 
Japanese Tree Peonies
Gessekai (Kingdom of the Moon) Immense double white...$8.00

Article (magazine)  (Jan 1955)  Page(s) 20.  
 
In white, (Class I, of the American Peony Society), there are 'Gessekai,' 'Godaishu,' 'Fugi-oe-ryo,' 'Renkaku,' and 'Yaso-okina,' which are pure white throughout, 'Ima-chowkow,' which is creamy, and 'Kogane-zome' and 'Shuchiuka,' with pinkish and purplish splashes.

Article (magazine)  (Jan 1955)  Page(s) 57.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
'Gessekai'

Website/Catalog  (1941)  Page(s) [3].  
 
Tree Peonies
Gessekai (Lunar World). Best; rare and beautiful; pure white; 12 to 15 inches in diameter; crinkled petals. Strong grower...$20 00

Website/Catalog  (1940)  Page(s) 13.  
 
New & Rare Varieties...
Gessekai, Pure white, shrinks on all petals, strong growing, largest among peonies usully 12-15 inches in diameter ...Each $ 1.30

Website/Catalog  (1940)  Page(s) 7.  
 
Japanese Tree Peonies 
English translation in parentheses
60. Gessekai (Lunar world). Pure white, crinkled petals. 12 to 15 inches in diameter. Strong grower, rare and beautiful. Best white...$20.00