Magazine  (1966)  Page(s) n.  
 
Clematis (hybrids)...
From France. Plants presented by André Girault, Horticulteur-Pepinieriste, Orleans (Loiret). Received Nov. 18, 1959.
...261364. 'Xerxes'.

Website/Catalog  (1924)  Page(s) 107.  
 
Xerxès (Patens). Gr., violet, ligné pourpre.

Website/Catalog  (1912)  Page(s) 77.  
 
Spring & Summer Flowering Clematis.
Flowering during May, June and July.
As these flower upon the ripened wood of preceding year's growth, they must be but slightly pruned in winter.
Xerxes, dark violet, with crimson band...  1s. 6d

Website/Catalog  (1906)  Page(s) 69.  
 
Xerxes, violet with red stripes.

Book  (1898)  Page(s) 66.  
 
Variétés Horticoles
1er Groupe.—PATENS
Section III. — Jackmani.
Xerxès (Noble).  Fleur composée de huit sépales violet foncé, avec des lignes cramoisies.