Book  (1907)  Page(s) 142, 144.  Includes photo(s).
 
One of the grandest natural species (as distinguished from garden varieties) is Clematis lanuginosa.  This produces flowers of immense size, the colour a soft lavender-blue or lilac-tinted grey, which is enriched with a tuft of reddish anthers.  This plant does not flower so freely or so continuously as to satisfy the exigent florists, and the question has arisen, What can we do to improve it?
In the year 1858 Mr. George Jackman, of the Woking Nurseries, made an endeavor to meet that question, and extraordinary results have followed therefrom.  He crossed C. lanuginosa with C. Hendersoni, and obtained two new and splendid varieties, producing flowers remarkable for their richness of colouring, their excessive profusion, and their long continuance.  Rarely in the history of practical floriculture have we seen so great a triumph accomplished at one bound.  The two new sorts were named respectively C. Jackmanni and C. rubro-violacea.  The first-named is certainly one of the most popular garden flowers known.  The other, of which we present a faithful portrait, is less popular, but not less worthy of esteem; for its flowers are exquisitely coloured and lustrous, and are produced in the most prodigal profusion- in fact, a verandah well clothed with this clematis will present during the later summer months a display of colour of the most surprising and delightful character. [...]
It is a matter of interest that hybrid clematis may be grown in beds, and in this case require to be trained over hoopsto form a low convex shield-shaped mass of green leaves and gorgeous flowers.  For this purpose the best are Jackmanni, with violet-purple flowers; Rubro-violacea, with maroon-purple flowers; Alexandra, reddish-violet; Magnifica, purple and red; Rubella, deep claret; Star of India, reddish-plum with red stripe; Tunbridgense, reddish-lilac with mauve stripe.

Website/Catalog  (1906)  Page(s) 69.  
 
Rubro violacea, violet.

Magazine  (1878)  Page(s) 129.  
 
X C. rubro-violacea Hort. Jack. Belg, hort., p. 258, pl. 14. — On le dit hybride entre C. patens et C. Viticella.

Magazine  (1877)  Page(s) 261, 271.  
 
p. 261: Cl. Vitic. Mooreana. — Gartenflora, 1865, 83.

p. 271: Clematis rubro violacea (Jackman); rouge.

Magazine  (1877)  Page(s) 257-260, 271, pl. XIII.  Includes photo(s).
 
p. 257: NOTE SUR LES CLÉMATITES HYBRIDES. Planches XIII et XIV....
X Clematis rubro-violacea Hort. Jack. (X Clem. patente-Viticella). — Flor. and Pom., 1864, p. 265, c. tab. — Floral Mag., IV, 1865, pl. 215. — Fl. des Serres, XVI, 1862-65, p. 37, c. ic. col. — J. B. St-Pétersbourg, 1867, 35.
.... Pour donner une idée de la ravissante apparence de ces belles fleurs nous en figurons trois variétés, rubro-violacea, Jackmani et Duchesse d'Edinbourg : toutes trois ont été obtenues de semis par les soins de MM. Jackman : ce sont donc des variétés anglaises. Les deux premières sont déjà connues et appréciées : les modèles qui ont servi au peintre se trouvent chez M. D. Massange-de Louvrex, au château de Baillonville, près de Marche, en Ardenne. Ce sont deux plantes très-développées qui produisent chaque année plusieurs milliers de fleurs.....
Le Clématis rubro-violacea est, dit-on, un hybride du Clematis patens et Cl. Viticella. Nous voulons bien le croire, mais nous devons faire connaître à ce propos, une petite observation intéressante au point de vue de l'origine de la plante. Les fleurs du rubro-violacea qui se sont épanouies sur le vieux pied cultivé au château de Baïllonville, avaient des dimensions considérables pendant tout l’été dernier : leur diamètre atteignait même dix centimètres et elles brillaient des plus riches nuances de pourpre. Mais à mesure que la floraison s’avançait et que l’automne approchait, on voyait des fleurs de plus en plus petites ; elles ne mesuraient plus que cinq centimètres : leur couleur avait tourné au bleu foncé et l'envers des sépales était blanchâtre. Dans cet état les fleurs étaient en tout semblables à celles de la
Clématite de M. de Guasco (Clematis Guascoi) que la Belgique horticole a décrite et figurée en 1857 et qui est elle-même un produit horticole. La ressemblance de ces fleurs avec celles de certaines variétés anciennes du Clematis Viticella est d’ailleurs évidente.

p. 271: Clematis rubro-violacea (Jackman) ; rouge.

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 I. Perpetuals, Flowering in the Summer and Autumn, on Summer Shoots.
C. rubro violacea.  Maroon, shaded reddish violet.  $1.00.

Magazine  (1 Aug 1872)  Page(s) 236.  
 
L'Exposition de Birmingham ...27 juin....Clematis. M. W. Cutbush, 1^er prix, avec de fort beaux exemplaires de C. magnifica, rubro-violacea et Jackmanni.

Book  (1872)  Page(s) 140, 154.  
 
p. 140: C. RUBRO-VIOLACEA (Jackman) .—This is one of the earliest distributed of the Woking batch of hybrids, and has all the characteristics of the group as regards the profusion of flowers, and the successional continuity of their development. It has pinnatisect leaves, with ovate- acuminate, or in some instances ovate- lanceolate leaflets. The flowers are from four to six-sepaled, maroon-purple, flushed with reddish violet, the surface being very rich and lustrous, and a tuft of greenish stamens occupying the centre. This variety most nearly resembles that called Prince of Wales, but the tint of the flowers is somewhat deeper. It gained a First-class Certificate at South Kensington in August, 1863. A coloured figure appeared in the Florist and Pomologist ( 1864, 265) ; and it has been subsequently figured in the Flore des Serres (xvi., t. 1630-1) ; and in the Floral Magazine (t. 215) . 

C. VITICELLA MOOREANA ( Jackman ).— One of a batch of seedlings raised at the Woking Nursery, the result of a cross between C. lanuginosa and C. Viticella, but partaking of the general character of the latter parent. The flowers are large for this type, with erect sepals, much recurved at the edge, and forming a convergent flower, of a deep violet colour. It was commended when exhibited at South Kensington in 1864, but has not been sent out.

Website/Catalog  (Aug 1866)  Page(s) 31.  
 
Clematis rubro violacea....1 Thaler 20 Groschen

Magazine  (Mar 1865)  Page(s) 83.  
 
 Neue Zierpflanzen. a) Empfohlen in den Proceedings of the Horticultural Society, von der zur Prüfung der ausgestellten Pflanzen beorderten Commission.
1) Clematis Viticella amethystina und Mooreana. Zwei neue Formen, dieser selbst noch in Petersburg halbharten Schlingpflanze. Die erstere mit blassvioletten aufrechten und am Rande zurückgerollten Blumenblättern, — die andere mit tief violetten grossen Blumen.

Translation:
New ornamental plants. a) Recommended in the Proceedings of the Horticultural Society, by the Commission appointed to examine the plants exhibited.
1) Clematis Viticella amethystina and Mooreana. Two new forms of this climbing plant, which is still half-hardy even in Petersburg. The former with pale violet upright petals and rolled back at the edge, — the other with deep violet large flowers.