Article (magazine)  (Jan 1955)  Page(s) 25.  
 
Varieties Raised in America. All by Professor Saunders...
The "Black Pirate Group." Crimson to very dark, almost black maroon, single to double...
'Red Jade,' (1948)

Article (magazine)  (Jan 1955)  Page(s) 59.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Lutea hybrid, Scarlet, 'Red Jade' (Saund. 1948), [Gardens] Scott Foundation

Book  (1944)  Page(s) 104.  
 
For next year 1945
Make a master list of tree peonies to be grafted & check them off as done.
For 1944
...Red Jade 13032 6 [grafts]

Book  Page(s) 9.  
 
13032 (Boston 1940) Single. Dark scarlet. no blue. Very fine named "Red Jade" best of our scarlets sofar.
1940 3 grafts in 9(17)

Book  Page(s) 77.  
 
Red Jade 13032 LD [lutea delavayi] x Hockellek Black [illegible].Mother plant in 18.2
Boston '40. Single stark scarlet....Best of our scarlets so far. Great beauty red...