Book  (Apr 1999)  Page(s) 449.  
 
Simplicity ('Irish Simplicity') Hybrid Tea. H. Dickson, 1909. The author cites information from different sources... Pure white...

Book  (Apr 1993)  Page(s) 553.  
 
Simplicity Hybrid Tea, pure white, single, 1909, Dickson, H. Description.

Book  (1936)  Page(s) 666.  
 
Simplicity (HT) H. Dickson 1909; pure white, medium size, single, water lily-form, open, lasting, in clusters of 2-5, fragrance 4/10, floriferous, continuous bloom, growth 6/10, short, dense. Sangerhausen

Book  (1936)  Page(s) 363.  
 
Irish Simplicity (HT) H. Dickson 1909; pure white, very large, single = Simplicity. Sangerhausen

Website/Catalog  (1929)  Page(s) 34.  Includes photo(s).
 
Single Roses
These are Hybrid Tea Roses with single or almost single flowers, and require the same culture and care as the other Hybrid Teas. They are often called the "Irish Singles", although they are not all of Irish origin. The buds are especially fine, but the open flowers are rather perishable although they are very freely produced.
Simplicity. Hybrid Tea. (H. Dickson, 1909.) Large, pure white flowers which keep well; slightly fragrant. Moderate upright growth and fair quantity of bloom. Foliage normal.
Noted for its pure color and beauty of form. See illustration facing page 32.

Magazine  (Aug 1924)  Page(s) 84.  
 
[Comments of Comtessa de Senni - Mary Gayley (December 1884 Birdsboro PA - March 14, 1971 Rome) married Count Giulio Senni in 1907]
J'ai un faible pour les roses simples et les hybrides de Bengala; je les trouve utiles surtout pour leur dernière floraison qui, quelquefois, atteint la Noël et même le plein hiver; leur légèreté permet à leurs fleurs de s'épanouir quand les nuits froides empêchent aux autres roses de s'ouvrir, ce qui les rend semblables à des pommes de choux. La couleur de Nobel soit en bouton soit ouverte est surprenante ; belles aussi sont les roses Irish Fireflame, K of K, Vesta, Simplicity, Innocence, Hawlmark Crimson. Parmi les Bengala, Mme Laurette Messimy est une rose « à toute épreuve », il faut citer également : Mrs Ed. Clayton, Mme E. Resal, Comtesse de Cayla, Mlle Mab et Mlle de la Valette, celle dernière est bien jolie, et de couleur fraise.

Website/Catalog  (1921)  Page(s) 36.  
 
Roses.
Simplicity, pure white; class: Single; habit of growth: very vigorous.

Article (newspaper)  (12 Apr 1919)  
 
The Suburban Half Acre. Garden Chat. Single and Semi-Single Roses. by ‘Speargrass’.
‘Simplicity’ (Hugh Dickson, 1909).— Pure white, immense flower, with large cupped petals of great substance, lasting a long time in good condition. The finest of all single roses for massing, bedding, and garden planting.

Magazine  (Jan 1919)  Page(s) 11.  
 
Simplicity. Très large fleur blanc pur.

Book  (1918)  Page(s) 138.  
 
J.K. Ramsbottom,Wisley.  Single Hybrid Tea Roses and Their Decorative Value.
One of the best pure white single H.T.'s for massing and for growing on small pillars is Simplicity. The buds are cup-shaped in form and the large flowers, occasionally having two rows of petals, are produced in quantity. The yellow anthers lend their charm, and when seen in the distance the flowers resemble a mass of pigmy white water lilies.