Book  (Jan 2000)  Page(s) 229.  
 
Iwato-kagami Tree Peony. ex Japan pre-1895... pink-red

Article (magazine)  (Jan 1955)  Page(s) 57.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Japanese, Scarlet, 'Iwato-kagami' (Sacred Mirror) (Jap. bef. 1895), [Gardens] scott Foundation, John J. Tyler Arboretum

Website/Catalog  (1941)  Page(s) [3].  
 
Tree Peonies
Iwato-Kagami. Loosely double; broad petaled; clear salmon-pink...$7 50

Website/Catalog  (1933)  Page(s) [4].  
 
Tree Peonies - The King of Flowers
Iwato-Kagami—Double, clear pink... $6.00

Website/Catalog  (1914)  Page(s) 7.  
 
Paeonia Moutan (Japanese tree peony)
7. Iwatokagami, Rosy scarlet petals with tasselled golden anthers, 10 [inches across].

Website/Catalog  (1909)  Page(s) 12.  
 
Paeonia Moutan...
18. Iwato-kagami, rosy scarlet petals with tasselled golden anthers, 10 inches.

Book  (1907)  Page(s) 50.  
 
The Moutan or Tree-Peony....Iwato-kagami. Fine pink.
 

Website/Catalog  (1907)  Page(s) 179.  
 
Japanese Tree Peonies.
6 Iwato-kagami. Fine, pink.

Website/Catalog  (1898)  Page(s) 13.  
 
Peonies.
Paeonia Mouton. Tree Peony.
This plant is already well-known to the West. Flowers in May, widely differing in color and form. Stems either shrubby or branched from the foot. The best species are native of central Japan. The flower often attains one foot in diameter. These plants have fanciful names in Japanese, which we give with as nearly as possible the English equivalent.
Double grafted set of 20, no two alike, $4.00. 1 case of 100 peonies comprising 25 varieties, $18.50.
III. Light Pink.
Iwato kagami, Mirror of the Far East...

Website/Catalog  (1898)  Page(s) 11.  
 
PÆONIA MOUTAN. (Tree Peonies.)
18. Iwato-Kagami, large pink petals, enormous flower.