Article (magazine)  (Jan 1955)  Page(s) 57.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Japanese, Scarlet, 'Impumon' (Gate of Impu) (Chug. 1932), [Gardens] University of Washington Arboretum, [Nurseries] william Gratwick