Article (magazine)  (Jan 1955)  Page(s) 20.  
 
In purple, (Class VI), 'Rimpo' and 'Ruriban.'

Article (magazine)  (Jan 1955)  Page(s) 59.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Japanese, Purple, 'Ruriban' (Indigo Purple Tray) (Jap. bef. 1893), [Gardens] Morton Arboretum, Scott Foundation, [Nurseries] Oberlin Peony Gardens

Website/Catalog  (1941)  Page(s) [3].  
 
Tree Peonies
Ruriban. Semi-double; dark purple...$4 00

Website/Catalog  (1939)  Page(s) [1].  
 
Tree Peonies (Pæonia arborea)
Japanese Tree Peonies 
English translation in parentheses
54. Ruriban (Ultramarine Light). Large; semi-double; satiny dark red. Extra fine. Good bloomer... $6.00

Website/Catalog  (1933)  Page(s) [4].  
 
Tree Peonies - The King of Flowers
Ruriban—Semi-double, purple... $10.00

Website/Catalog  (1926)  Page(s) 107.  
 
Pivoines en arbre, du Japon... Ruriban.- Fleur simple, très large, pourpre violet foncé, pétales rayés de blanc.

Website/Catalog  (1914)  Page(s) 8.  
 
Paeonia Moutan (Japanese tree peony)
21. Ruriban, Rich purple petals, with primrose tasselled anthers, 12 [inches across].

Website/Catalog  (1909)  Page(s) 12.  
 
Paeonia Moutan...
27. Ruriban, rich purple petals with primrose tasselled anthers, 12 inches.

Book  (1907)  Page(s) 50.  
 
The Moutan or Tree-Peony....Ruriban. Dark purple.

Website/Catalog  (1907)  Page(s) 179.  
 
Japanese Tree Peonies.
9 Ruriban. Dark purple.