Newsletter  (Feb 2013)  Page(s) 6.  
 
Boll also bred the hybrid perpetual ‘Mme Trudeau’ in 1850, the spinosissima hybrid ‘Souvenir de Henry Clay’ in 1854, and several others.

Book  (Dec 2000)  Page(s) 38.  
 
Souvenir de Henry Clay Pimpinellifolia. Daniel Boll (New York, New York) [w/Portemer] 1854

Book  (Apr 1999)  Page(s) 185.  
 
Souvenir de Henry Clay Pimpinellifolia. Boll/Portemer, 1854. The author cites information from different sources... Light pink... light lilac pink... This rose was bred by Mr. Boll, of New York in the U.S... Henry Clay, American politician, lived. 1777-1852.

Book  (1936)  Page(s) 159.  
 
Clay, Souv. d'Henry (pompon centifolia) in America ? ; white.
Clay, Souv. d'Henry (pimpinellifolia) Boll 1855; light pink to white, medium size, double, imbricated, growth 7/10.

Book  (1906)  Page(s) 155.  
 
10.016. Souvenir de Henry Clay, Pimprenelle, Boll 1855 rose clair

Book  (1902)  Page(s) 151.  
 
Race des Rosiers Pimprenelle
5638. Souvenir de Henry Clay... (Boll)... rose clair.

Magazine  (1 Jul 1886)  Page(s) 108.  
 
Rosa spinosissima ou Rosier Pimprenelle
Variétés remontantes.
Souvenir de Henry Clay (Boll), moyenne, très pleine, rose lilas clair.

Book  (1882)  Page(s) 34.  
 
Souvenir de Henry Clay... Da. H. Boll. 1854 Rose pâle. Fleur moyenne. Plante moyenne.

No explanation given for the class abbreviation " Da. H." in the abbreviations key.

Website/Catalog  (1880)  Page(s) 264.  
 
Rosiers Pimprenelles et Microphylles (sarmenteux)
1372. Souvenir de Henry Clay. — Moyenne, pleine, rose clair.

Book  (1874)  Page(s) 146.  
 
Rosiers Sarmenteux.
Pimprenelles.
Souvenir de Henry Clay, fleur moyenne, beau rose clair.