Website/Catalog  (1939)  Page(s) [1].  
 
Tree Peonies (Pæonia arborea)
Japanese Tree Peonies 
English translation in parentheses
58. Shiro-Kagura (Oberlin, 1922). Large; semi-double; brilliant salmon-rose, with central cushion of golden anthers. Profuse bloomer. Very erect and attractive. Light green foliage... $7.00

NB: I think this description was transposed from that of another peony... 'shiro' means white, and the description doesn't match in other ways

Website/Catalog  (1924)  Page(s) 152.  
 
Pivoines en arbre, du Japon...Shiro Kagura.- Fleur semi-double, blanc pur à onglet violet.

Website/Catalog  (1909)  Page(s) 11.  
 
Paeonia Moutan...
7. Shiro-kagura, pure white petals with purple feathers at base distinct and very beautiful, tasseled yellow anthers, 10 inches.

Book  (1907)  Page(s) 50.  
 
The Moutan or Tree-Peony....Shiro-kagura. White, suffused with pink.

Website/Catalog  (1907)  Page(s) 179.  
 
Japanese Tree Peonies.
11 Shiro-kagura. White, suffused with pink.

Website/Catalog  (1898)  Page(s) 9.  
 
PÆONIA MOUTAN. (Tree Peonies.)
7. Shiro-kagura, white very slightly tinted pink