Book  (1928)  Page(s) 63.  
 
Check List of Japanese Peonies
Yamato-Sangai (Crown-on-Crown). (Origin unknown.) Pink.

Book  (1928)  Page(s) 57.  
 
Check List of Japanese Peonies
Crown on Crown (Yamato-Sangai). (Origin unknown.) Pink.

Website/Catalog  (1919)  Page(s) 13.  
 
Pæonia Albiflora. (Herbaceous Peonies.)
3. Yamato-sangai, guard petals blush, full double, narrow petaloids separate from top petals forming three stories.

Website/Catalog  (1915)  Page(s) 42.  
 
Japanese Peonies
Including direct importations from Japan, and Kelway's "Imperial" and Hollis' New Seedling Japanese Peonies
A new race of Peonies of a distinct type, forming a separate class, intermediate between the single and the double types, and distinguished by their stamens being transformed into narrow petaloids. [...]
I have retained the Japanese names, with their translation, prefixed by the Amreicannames, which were given to this set by the Peony Society of the American Florists.
Crown on Crown (Yamatosangai—The three states of existence). Pink petals forming three layers in different shades. $2.

Website/Catalog  (1914)  Page(s) 8.  
 
Paeonia Albiflora
14 Yamato-sangai, Full double tall flower, outer and center petals soft flesh color interposed by creamy white narrow petals fine[ly] arranged in three layers.

Website/Catalog  (1898)  Page(s) 12.  Includes photo(s).
 
Paeonia Officinalis. (Herbaceous Peonies.)
A rich Japanese flower, perennial, flowering in middle of summer.
3. Yamatosangai. Pink petals forming three layers in different shades.

Website/Catalog  (1896)  Page(s) 13.  
 
Pæonia Officinalis.
Herbaceous Peony.
This is a most attractive object during early summer. The immense flowers of gorgeous colors last better than the tree peony.
Deep Crimson.
Yamato Sangai, Japanese Pride...

Website/Catalog  (1896)  Page(s) 10.  
 
Pæonia Officinalis.
Herbaceous Peony.
Deep Crimson.
Yamato Sangai, Japanese Pride...

Magazine  (15 Aug 1894)  Page(s) 234.  
 
Un Catalogue Japonais
De loin, nous avions pris cette grande brochure de 112 pages pour un catalogue de la maison Vilmorin-Andrieux et C^ie. Il s'agit en réalité un catalogue de la Société d'horticulture de Komagome Denchu, à Tokio, sous la direction de M. F. Takaghi. [...] Il renferme...les Paeonia officinalis en groupes de coloris blanc, rose, cramoisi, panachés, et quelles dénominations! En voici des échantillons: Hakuseiko (étoile blanche), Tagonoura (Rive du Tage), Fujisumizome (Wistaria), Kesho (dame en toilette), Higurashi (crépuscule), Heianko (rose impériale), Yamatosangai (orgueil japonais)—cette dernière est figurée en chromo sur la couverture et droit être fort jolie, si le dessin est fidèle—Kasanejishi (les deux lions)!