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

Website/Catalog  (1949)  Page(s) 37.  
 
Peonies
Rare Tree Peonies (Nov. delivery)
Japanese Varieties. $8.50 each
Hakugan. Large, double; white, pink base.

Website/Catalog  (1924)  Page(s) 152.  
 
Pivoines en arbre, du Japon...Hakugan.- Semi-double, blanc pur, pétales laciniés.

Website/Catalog  (1909)  Page(s) 12.  
 
Paeonia Moutan...
23. Hakugan, pure white petals, with tasseled yellow anthers, 10 inches.

Website/Catalog  (1898)  Page(s) 11.  
 
PÆONIA MOUTAN. (Tree Peonies.)
23. Haku-gau, white very large flower.