Book  (1907)  Page(s) 45.  
 
396. CADOGAN; P....(Kelway)
(1) 1901, The Gardening World, Vol. 17, p. 680.
(2) 1904, Harrison's Peony Manual, p. 52.

Book  (1904)  Page(s) 52.  
 
Single Paeonys.
I name a few of the leading ones from Kelway's list.
Countess Cadogan. Lovely flesh color.

Website/Catalog  (1902)  Page(s) 15.  
 
Kelway's New Single-Flowered Pæonies of 1900-1901.
Countess Cadogan, lovely flesh colour.

Magazine  (22 Jun 1901)  Page(s) 408.  
 
Pæonies.—Messrs. Kelway have favoured us with a sample of their superb Pæonies. [...] Among the so-called single and semi-double flowers are:
Countess Cadogan.—A semi-double flower, with pale rose-pink petals encircling the yellow stamens.

Magazine  (22 Jun 1901)  Page(s) 686.  
 
Pæonies From Langport.
A boxful of named varieties has reached us from Messrs. Kelway and Son, Langport, Somerset.
Three single varieties represented a class favoured by many growers who prefer single to double flowers. Countess Cadogan is notable for its large silvery pink flowers, with a great brush of yellow stamens in the centre as in the case of Doris.