Book  (1880)  Page(s) Annex, p. 111.  
 
hybrid perpetual, Bourbon. Princesse Hélène, purple-pink, medium size, very double, floriferous.

Book  (1874)  Page(s) 26.  
 
Hybrid Perpetual.
And yet they [the Hybrid Perpetuals] are of quite modern origin, the first of the race (known to be such), Princesse Helene, dating back only to 1837.

Book  (1864)  Page(s) 50.  
 
Historique de la Culture du Rosier.
C'est à M. Laffay que revient l'honneur d'avoir créé la magnifique race hybride remontante: les premières variétés, le prince-albert et la princesse-hélène, furent obtenues par lui en 1837, mais son triomphe fut la superbe rose la reine, gain de 1843. Citons encore les roses gracieuses duchesse-de-sutherland, auguste-mie, madame-laffay. (Cet habile rosiériste habite maintenant l'Algérie.)

Website/Catalog  (1859)  Page(s) 10.  
 
Bourbon Roses.
Princesse Helene—Bright crimson.

Website/Catalog  (1848)  Page(s) 79.  
 
Hybrid perpetuals...Princesse Hélène

Book  (1848)  Page(s) Div. II, p. 135.  
 
Hybrid Perpetuals...How came we in possession of these lovely Roses which have so suddenly delighted us with their presence, forming, as they do, the most valuable Group among Autumnals! Their origin is various ; doubtless, in many instances unknown. The first varieties were raised by M. Laffay from between the Hybrid Bourbon or Hybrid Chinese and Damask Perpetual. Princesse Hélene, which was introduced in 1837, was the first striking variety that was obtained ,Queen Victoria followed next; and in 1840 there were above twenty varieties enumerated in the Rose Catalogues. Several of these, however, were drawn from other Groups: one-fourth were Bourbon Perpetuals.

Book  (1848)  Page(s) Div. II, p..  
 
Hybrid Perpetuals...Princesse Hélène; flowers rosy purple, of medium size, very double; form, globular. Habit, erect; growth, moderate. A most abundant bloomer, when in full vigour.

Website/Catalog  (1847)  Page(s) 86.  
 
Rosiers Hybrides Remontants. 
§ 2. Variétés ayant des rapports aux hybrides de Bengale par leurs bois et feuillage, et aux portlands par leurs ovaires.
***Princesse Hélène (greffé), fleur grande, très multiple ou pleine, rouge clair...2 fr.

***Indique le plus franc remontant

Website/Catalog  (1846)  Page(s) 11.  
 
Portlands et Hybrides, à fleurs perpétuelles.
Princesse Hélène...Rouge pourpre...1 25 fr.

Book  (1846)  Page(s) 22.  
 
Hybrid Perpetuals...Princesse Hélène, very beautiful, some fragrance. Bluish carmine-red, not quie 2 inches wide, double.