Book  (Jan 2000)  Page(s) 237.  
 
Marchioness Hybrid Tree Peony (Saunders 1942). A single mauve-rose hybrid

Magazine  (Sep 1977)  Page(s) 21.  
 
"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...
Marchioness—2-3 rows of petals, suffused tea-rose color and of heavy substance. Flares very dark; filaments dark and abundant. Stigmas creamy pink; sheath creamy lilac. Heart is dark and dramatic.

Article (magazine)  (Jan 1955)  Page(s) 25.  
 
Varieties Raised in America. All by Professor Saunders...
The "Tea Rose Group." Generally yellow, but tinted or suffused reddish, single to double...
'Marchioness,' (1942)

Article (magazine)  (Jan 1955)  Page(s) 58.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Lute hybrid, Yellow with reddish tones, 'Marchioness' (Saund. 1942), [Gardens] 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.
For 1944
...Marchioness 12739 4+3 [grafts]

Book  Page(s) 6.  
 
Lutea Hybrids
12739 Marchioness 1939 5 grafts in 8(10) 4 grafts in 8(11) 2 took
1940 5 grafts in 16(1)
1941 4 salable grafts in 8(10)

Book  Page(s) 68.  
 
Marchioness 12739 L.D. [lutea delavayi] x miuxed t.p. [tree peony] Mother plant in 5.1
1939 5 grafts in 8(10) 5 took 4 in 9(11) 2 took
...1941..Heavenly flower. Soft yellow suffused pale strawberry pink; wine colored & ...center
Beautiful flower style...Single