Book  (Jan 2000)  Page(s) 231.  
 
Rimpou Tree Peony. ex Japan pre-1926... purple

Website/Catalog  (1956)  Page(s) [1].  
 
Japanese Tree Peonies
Rimpo (Bird of Rimpo) Giant glistening double purple...$8.00

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, Purpla, 'Rimpo' (Bird of Rimpo) (Jap. bef. 1926), [Gardens] Scott Foundation, University of Washington Arboretum, Whitnal Park Botanical Gardens, [Nurseries] William Gratwick, Oberlin Peony Gardens

Website/Catalog  (1939)  Page(s) [1].  
 
Tree Peonies (Pæonia arborea)
Japanese Tree Peonies 
English translation in parentheses
53. Rimpo (Bird of Rimpow). Large, medium-double flowers of a reddish brown color... $10.00