Book  (1906)  Page(s) 54.  
 
Principal garden varieties of Clematis:
Jackmanni type.  (July to October.)
Thomas Moore... Puce-violet.

Book  (1904)  Page(s) 331.  
 
Other hybrids or varieties of C. Jackmani are: Var. Thomas Moore, Jackman (C. Thomas Moore, Hort.), as large as the last ['Mrs. Moore', 8-9 inches across], rich violet, with white stamens...

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 :
3° Dans le groupe des Clematis hybrida Hort. ou Cl. Jachmanni : François Morel, hybrida fulgens,  Jackmanni et Jackmanni superba, M^me Edouard André, M^me Furtado Heine, M. Thomas Moore, Neptune, Etoile violette, hybrida splendida, velutina purpurea.

Book  (1898)  Page(s) 72.  
 
Variétés Horticoles
IIIe Groupe.— VITICELLA.
Thomas Moore (Jackman).  Fleur de 14 à 16 centimètres de diamètre, à sépales violet rougeâtre.

Magazine  (Nov 1881)  Page(s) 172-3.  
 
A Few Words About the Clematis.
It is hardly fair to give so lovely a plant as the Clematis a mere passing mention.  The tender, faint, silvery white of C. Lucie Lemoine, the broad gleaming white of C. Gloire de St. Julienne and Henryii, and the rich royal purple of C. Thomas Moore, Prince of Wales, patens or azurea, and Jackmani, the latter almost the best of all, come to us as a surprise; almost a miracle as we first behold their tender petals resting on masses of shining leaves.

Magazine  (Feb 1879)  Page(s) 50.  
 
The Clematis.
Here is a list of some of the best and most distinct of the [summer]-flowering varieties: Alexandra, Jackmanni, Lady Bovill, lanuginosa, lanuginosa nivea, magnifica, rubella, Thomas Moore, Tunbridgiensis, vilustina purpurea, and viticella rubra grandiflora.

Magazine  (1877)  Page(s) 260, 271.  
 
p. 260: Thomas Moore. — Fl. a. Pom., 1869, p. 265, c. ic. col.

p. 271: Clematis Thomas Moore (Jackman), 1872, s. Viticella; violet.

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. Thomas Moore.  (New.)  Pucy violet, with white stamens, passiflora like.  Superb.  $2.00.

Book  (1872)  Page(s) 146-7.  
 
Descriptive Notes of Species & Varieties.
C. Thomas Moore (Jackman). — This is one of the finest of the Woking hybrids, the flowers being of a bold and well-contrasted character, and the plants of a vigorous habit.  The leaves are large, and pinnatisect, with ovate leaflets which are much acuminate.  The flowers have from four to six narrowish sepals, and are very large, amongst the largest indeed of the purple-flowered sorts, being often as much as from eight to nine inches across, of a deep rich pucy-violet, and having a very prominent tuft of white stamens, which give to them something of the appearance of giant passion-flowers.  The buds are long, dull dark purple, and erect, and the sepals when extended are rather elliptic than ovate.  The flowers are produced in successional and copious masses, though not quite so abundantly as those of the true Jackmanni type; but their large size, and the fine contrast between the sepals and the stamens, entitle it to take a place in the front rank of ornamental modern varieties.  Its merit was marked by the award of a First-class Certificate at South Kensington, in August, 1867; and an excellent figure of it, necessarily much foreshortened on account of its size, will be found in the Florist and Pomologist (1869, 265).

Magazine  (Nov 1869)  Page(s) 265.  Includes photo(s).
 
Clematis Thomas Moore
With an Illustration.
Of the many beautiful forms of the Hardy Hybrid Clematis for which the lovers of gardens have to thank Mr. George Jackman and the Woking Nursery, that which we now figure is certainly one of the finest.  It is, in the first place, the largest at present known, since the flowers measure, when expanded, as much as from 8 to 9 inches across.  It is, in the next place, one of the most striking and effective in its colours, which effect results from the large spreading tuft of filaments in the centre being white, so that they contrast strongly with the rich violet hue of the sepals, and give the flowers quite the semblance of belonging to some giant passion-flower.  It has the free-growing and free-blooming habit of the other Woking hybrids, and must be set down as one of the best and most distinct of the series.