Book  (1907)  Page(s) 120.  
 
1317. KAISERIN; P. albiflora.
(1) 1899, Peter Barr & Son Cat.
(2) 1900, The Gardening World, Vol. 16, p. 710.

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. 
Singles.—The singles are varieties of Paeonia albiflora...
Kaiserin is a delicately beautiful pink...