Book  (Jan 2000)  Page(s) 235.  
 
Black Pirate Hybrid Tree Peony. Saunders 1948. A single or semi-double red hybrid

Book  (Jan 1999)  Page(s) 210, 211.  Includes photo(s).
 
Page 210: Black Pirate Tree Peony. Saunders (USA) 1948. Single or semi-double red... Very dark red, shiny petals contrast with yellow stamens...
Page 211: [Photo]

Magazine  (Sep 1977)  Page(s) 19-20.  
 
"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...
Black Pirate—3-4 rows of huge dark red satiny petals. Flares "black" and wide. Filaments very dark. Stigmas bright pink; sheath lilac. Only rare side-buds. Foliage broader than Thunderbolt, which is very similar to Black Pirate.

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...
'Black Pirate,' (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, 'Black Pirate', (Saund. 1935), [Gardens] Morton Arboretum, Scott Foundation, [Nurseries] William Gratwick

Book  (1944)  Page(s) 104.  
 
For next year 1945
Make a master list of tree peonies to be grafted & check them off as done.
...Black Pirate...36+3+1

Book  Page(s) 49.  
 
Black Pirate (1935) #8021 Delavayi x Cherry red t.p. [tree peony]. Mother plant in 9(5) now 7
vote or commendation Mass. H.S. 1938
1938 5 grafts...
1939 12 grafts...
1940 6 grafts...17 grafts...

Book  Page(s) 101.  
 
8021 Black Pirate Vote of Commendation Boston 1938 see below
...Black Pirate mother plant in 9(5) now 7
1 graft in 16(3) now 14...