Magazine  (17 Nov 1900)  Page(s) 537.  
 
La Maladie noire des Clématites à grandes fleurs....Les variétés qui été les plus atteintes au Jardin botanique de la Ville sont :
1° Dans le groupe des Clematis patens Dcn. : Edouard Desfossé, Bélisaire, Ma Favorite, Sophia, Sophia flore pleno et Uranus.

Magazine  (1877)  Page(s) 261, 271.  
 
p. 261: Cl. pat. Sophia fl. pleno. — Ill. hort., V, pl. 184. — Fl. des Serres, VIII, 279.

p. 271: Clematis Sophia flore pleno (Siebold); Japon; double azuré.

Website/Catalog  (1875)  Page(s) 79.  
 
CLEMATIS. Virgin's Bower.  Waldrebe, Ger. Clematite, Fr.
The Clematis are elegant, slender branched shrubs, of rapid growth, handsome foliage and beautiful large flowers of all colors.  The newer varieties introduced within the last five or six years are great acquisitions.  Either in the open ground as pillar plants, bedding plants, single plants in masses or about rock-work, or cultivated in pots or tubs, the Clematis cannot be excelled.
We append the following from the English "Gardener." Jackman's Clematises: "They are magnificent; and more than this, they do give us some of the grandest things in the way of creepers the horticultural world has ever seen, making glorious ornaments either for walls, verandahs, or rustic poles or pillars, varying in color from deep rich violet hue to dark velvety maroon, and in the newer seedling forms, beautiful shades of pale bright blue."
They will stand the severest Winters if the roots are slightly covered.
Class II. Varieties Flowering in the Spring and Early Summer, on the Old or Ripened Wood.
C. Sophia pleno.  Double mauve, outer sepals, pale yellowish white.  $1.00

Book  (1872)  Page(s) 142-143.  
 
C. SOPHIA PLENA (Siebold).—This variety, which was introduced directly from Japan by M. Von Siebold, differs from C. Sophia chiefly in the circumstance that the flowers are semidouble, their colouring being similar to that of C. Sophia. Hence it bears some analogy to the sort called C. John Gould Veitch, but the flowers are larger than those of that variety, and of a looser form . A figure is given in the Illustration Horticole (v. , t. 184) . 

Magazine  (7 Sep 1867)  Page(s) 926.  
 
"Climbing Plants" by William Paul.
...The following are amongst the best of climbing plants, selected for the rapidity of their growth or the beauty of their flowers: they lose their leaves on the approach of winter:
Clematis Sophia flore-pleno. — Flowers pale blue, whitish towards the centre, double.

Website/Catalog  (1867)  Page(s) 21.  
 
Clematis patens Sophia flore pleno ...2 Francs

Magazine  (1865)  Page(s) Vol. 16, p. 39.  
 
C. patens Sophia fl. pl. (Lemoine)

Book  (28 Dec 1861)  Page(s) 4.  
 
Clematis patens Sophie fl. pl. 1 Thaler 1 Gulden 50 Kreutzer

Magazine  (Aug 1859)  Page(s) 544.  
 
Clematis patens DCNE, var. Sophia, flore pleno. — Illust. hort., l. c., pl. 184. — Clématite ouverte, var. Sophie à fleurs pleines. — Japon. — (Renonculacées). Belles fleurs pleines, d'abord à peine rosées, bientôt d'un rose plus décidé, puis lilacées pâles, enfin blanches.

Magazine  (Nov 1858)  Page(s) 248.  
 
Illustration horticole .... Clematis patens, var. Sophia, flore pleno.- Pl. 184
Nous ne pouvons que recommander ce clematis à fleurs doubles passant graduellement du rosé au rose au lilaciné, puis enfin au blanc en viellissant.