Book  (Jan 2000)  Page(s) 235.  
 
Corsair Hybrid Tree Peony (Saunders 1948). A single red 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...
Corsair—Very single; 10-20 pointed, notched, and ruffled petals. Dark maroon, heaviest substance. Flares large, "black". Filaments coarse, black. Stigmas small, pink. Sheath creamy lilac-rose. Foliage ferny. With Heart of Darkness, the two darkest maroon in color.

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...
'Corsair,' (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, Crimson, 'Corsair' (Saund. 1941), [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
...Corsair 12710 2 [grafts]