Website/Catalog  (Jun 2004)  Includes photo(s).
 
[From website]
We know that the original C. 'Candida' was introduced in 1862 by Victor Lemoine, who reported its parentage as C. lanuginosa × C. patens. But the plant as originally described has some arguable differences from the one we know today, and it is not quite clear that it still survives. The North American version of 'Candida' has little to nothing of the grayish to lavender shading ascribed to the young flower nor the dark stamens at the center, though it has some claim to the brilliant white (L. candidus: glossy or pure white) of the original.
What is intriguing is that the flower of our current 'Candida' seems virtually identical to that of another cultivar more prominent in the international trade: 'Marie Boisselot.' As we might expect, the formal descriptions of those two varieties do not match up in every particular, and as yet there has been no rigorous attempt to analyse them side by side, independently of labels. The possible connection raises some interesting historical questions. How did 'Candida' lose out in Europe and England? How did the North American trade get its 'Candida,' years before it ever imported 'Marie Boisselot'? And so on. For years students of clematis have been trying to penetrate the confusion of IDs that has hovered over several of the most prominent whites: over 'Marie Boisselot,' 'Mevrouw Le Coultre,' and 'Madame Van Houtte,' as well as 'Candida.' Most of the identities seem now to have been worked out, but there is still the hazard of mistaken labels.

Book  (1999)  Page(s) 236.  

Book  (Apr 1998)  Page(s) 128.  

Magazine  (28 Jul 1937)  Page(s) 56.  
 
TWENTY BEST LARGE-FLOWERED HYBRIDS OBTAINABLE IN THIS COUNTRY
Lanuginosa candida, grayish white, Lanuginosa Type
All bloom on new wood except Belle of Woking and Sir Garnet Wolseley

Website/Catalog  (1912)  Page(s) 78.  
 
Summer and Autumn Clematis.
In bloom from July to October.
These flower upon the wood of the current year's growth, and should therefore be pruned to five or six eyes.  
Lanuginosa Candida, white, slightly tinted lilac...  2s. 0d.

Website/Catalog  (1907)  Page(s) 65.  
 
Clematis in pots to plant out in spring and summer.
General Collection.
41 Lanuginosa candida, pearly white.

Book  (1906)  Page(s) 52.  
 
Principal garden varieties of Clematis:
Lanuginosa type. (July to October.)
Lanuginosa candida... Tinted greyish-white, large.

Magazine  (1900)  Page(s) 316.  
 
from "Hybrid Clematis" By Mr. A. G. Jackman, F.R.H.S.
Among the foremost hybridisers of the Clematis must also be mentioned Monsieur Lemoine of Nancy, who has raised several good varieties of the patens, lanuginosa and viticella types of recent years... C. lanuginosa candida [...] of the second type...

Book  (1898)  Page(s) 3.  
 
Les premières obtentions de M. Lemoine, de Nancy, furent: les Clematis lanuginosa candida, C. lanuginosa nivea, C. Otto Frœbel.

Magazine  (28 Oct 1882)  Page(s) 414.  
 
The Clematis in the Midlands.
...The sorts I have most successfully grown are the following, and the mode of cultivation that recommended by Mr. Jackman.  Lanuginosa type: Gem, lanuginosa, lanuginosa candida, Otto Frœbel, Princess of Wales, purpurea elegans, Gloire de St. Julienne.