Book  (Jan 2000)  Page(s) 235.  
 
Canary Hybrid Tree Peony. Saunders 1940. A single yellow 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...
Canary—Very single; 9-12 petals; one of the most brilliant yellows. Perfect form and heavy substance. Flares dark, wide, and brilliant. Filaments short, maroon, abundant; anthers long. Stigmas cream. Sheath cream. Foliage large and broad, a good deal of red. Upright grower on heavy stems.

Article (magazine)  (Jan 1955)  Page(s) 24.  
 
Varieties Raised in America. All by Professor Saunders...
The "Roman Gold Group." Yellow, clear or almost clear , generally single.
'Canary,' (1940)

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, 'Canary' (Saund. 1940), [Gardens] Scott Foundation, [Nurseries] William Gratwick

Magazine  (Mar 1954)  Page(s) 22.  
 
Hybrid Tree Peonies
...By far the most important work with these hybrids has been done by Prof. A. P. Saunders and his originations now number about 80. Their color range is truly remarkable. [...]
The list of hybrid tree peonies following is up to date as far as we could make it.
Originations of A. P. Saunders, Clinton, N.Y.
Hybrids of suggruticosa, lutea and Delavayi.
Canary, Single, bright yellow. 1939. 8.5.

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
...Canary 272 6+6+3 [grafts]

Book  Page(s) 1.  
 
Lutea Hybrids...272 Canary. 1939 8 grafts in 8(9)...growth in autumn...1940 6 grafts in 5(5) 17 in 9(17).

Book  Page(s) 51.  
 
Canary #272 Lutea x t.p. [tree peony]
Very good in 1940. Brighter...
1938 3 in 22(7) 2 in 23(1)
1939 8 grafted in 8(9)...

Book  Page(s) 101.  
 
Lutea x moutan hybrids
272 Canary Mother plant in 12 (4) 3 grafts 22(2) now 3