Book  (1907)  Page(s) 104.  
 
1118. HARCOURT, SIR WILLIAM; P. 
(1) 1899, Peter Barr & Son's Cat.. p. 47.

Magazine  (7 Jul 1900)  Page(s) 710.  
 
The Paeonies.
Messrs. Barr & Sons, King Street, Covent Garden, London, W.C., and Long Ditton, Surrey, as growers of hardy plants, &c., have over two acres devoted to them. On Staurday, June 23rd, notes were made of a number of fine varieties which they largely cultivate in their nursery at the address just given. 
Doubles.
Sir William Harcourt [is] a rich glowing crimson...

Website/Catalog  (1895)  Page(s) 23.  
 
Barr's Hardy Double Chinese Pæonies.
Very Deep Crimsons. (Mostly rose-scented, all beautiful.)
Sir William Harcourt, rich glowing crimson, 2/6.