Book  (Jan 2000)  Page(s) 238.  
 
Rose Flame Hybrid Tree Peony (Saunders 1952). A double rose hybrid

Magazine  (Sep 1977)  Page(s) 22.  
 
"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...
Rose Flame—Fully semi-double flower; many matte (no gloss) rounded petals in a rose-form. Unique color; rosy with an "ash-pink" or "smoky" tone. Flares small, dark. Filaments dark. Stamens few. Stigmas light pink; sheath lilac or invisible. Carpels about 8, "naked", cream-color. Plant rather dwarf, with reddish stems; foliage narrow, and matte (no gloss).

Article (magazine)  (Jan 1955)  Page(s) 25.  
 
Varieties Raised in America. All by Professor Saunders...
The "Banquet Group." Generally reddish, but with yellow undertone, single to double...
'Rose Flame,' (1950)

Article (magazine)  (Jan 1955)  Page(s) 59.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Lutea hybrid, Yellow with reddish tones, 'Rose Flame' (Saund. 1950), [Gardens] Scott Foundation

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.
Rose Flame, Double, deep rose. 1952.