Website/Catalog  (1928)  Page(s) 63.  
 
Series D
$1.00 each; $10.00 per dozen.
Two-year clumps $1.50 each, $15.00 per dozen.
Three-year clumps $2.00 each, $20.00 per dozen.
Included in this series are the best of the "older" varieties which have proved their worth and stood the test in many places...
L'Indispensable, very large flat blooms of delicate flesh pink.  Valuable as a cut flower.  [American Peony Society rating =] 7.3

Website/Catalog  (1912)  
 
Choice List of Peonies
L'Indispensable — Very large cup-shaped bloom, finishing with a high-built center; delicate blush, almost white; very striking.  75 cents each.

Book  (Apr 1907)  Page(s) 115.  
 
1253.  Indispensable; P...
(1) 1906, Florists' Exchange, June 9. (2) Cornell Plot No. 803.

Website/Catalog  (1905)  Page(s) 14.  
 
734.  L'Indispensable (Holland).
A very large variety, sent out from Holland as an improvement over any existing sort; not bloomed with us as yet.
1 year division $1.50