Book  (Jan 2000)  Page(s) 235.  
 
Coronal Hybrid Tree Peony. (Saunders 1948). A semi-double white and rose hybrid

Magazine  (Sep 1977)  Page(s) 20.  
 
"Botanical Descriptions of 40 Saunders Lutea Hybrids" by Dr. David Reath and Silvia Saunders
...These descriptions aim to provide the nurseryman and the average gardener with a means of determining the differences between the hybrids, many of which are very similar indeed...
Coronal—Single; 10-16 petals, pale creamy yellow, edged rosy. Picotee. Very finished flower in a "bell" shape. Flares lightly "brushed" on. Filaments short, reddish. Stigmas rose. Sheath purple. Heart is compact and regular. 

Article (magazine)  (Jan 1955)  Page(s) 25.  
 
Varieties Raised in America. All by Professor Saunders...
The "Mystery Group." Ivories, pearled shades, suffused mauves, single to double...
'Coronal,' (1941)

Article (magazine)  (Jan 1955)  Page(s) 56.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Lutea hybrid, Yellow, 'Coronal' (Saund. 1948)

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
...Coronal 16472 12 [grafts]

Book  Page(s) 17.  
 
16472 Coronal 1942. In 7.5 Deep ivory & pale yellow warmer towards center quite definitely edged & blushed with rose. Exquisite delicacy & stable. Kept its form perfect till petals fell. Graft