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'Jackmanii' clematis References
Website/Catalog  (1919)  Page(s) 67.  
 
Clematis Jackmanni-Hybrids....Jackmanni, purple-violet.... 10 pieces M 35.-, 100 pieces M 300.-
Book  (1915)  Page(s) 176.  Includes photo(s).
 
Clematis. — There is no more popular hardy climber than the Clematis.  One or two should be grown in the smallest garden.  They can be used to cover any structure from a few feet to 50 feet high.  A selection of different sorts will ensure a succession of flowers from April to October. [...] There are numerous named varieties; a dozen of the best to furnish flowers from May to October are as follows:
Jackmanii, violet-purple...
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.  The varieties most suitable for bedding are marked thus*.
*Jackmanii, intense violet purple; of a brilliant metallic hue...  1s. 6d
Magazine  (Aug 1909)  Page(s) 40-2.  
 
Origin of the Large-Flowered Clematis
Probably the most popular kind of clematis is Clematis Jackmani which is the common purple flower that we see on porches everywhere in summer.  If I were to give its pedigree now, it would only result in confusion.  The important fact is that all the large-flowered varieties of clematis, like this, are derived more or less directly from the common Virgin's bower (Clematis Viticella) of Southern Europe and what may be called the Chinese or ever-blooming clematis (C. lanuginosa), the former parent having supplied the wealth of color while the latter has contributed the great size.
[...]
The Purple Jackmani
The famous Jackmani, is a cross between Herdersonii and lanuginosa and resembles the Chinese parent in its habit, foliage, and size, also in having from four to six sepals, but its color of flower must have been derived from the European species.  Its purple is exceptionally rich and pure, and the color is much enhanced by the velvety texture.  It originated in 1858.  —W. E. Pendleton, Pennsylvania.
Website/Catalog  (1908)  Page(s) 21.  
 
CLEMATIS...Jackmanii. Velvety purple, free flowering, and the most popular variety....Each  .40, per 10  3.00
Book  (1907)  Page(s) 142, 144.  
 
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.
Book  (1906)  Page(s) 53.  
 
Principal garden varieties of Clematis:
Jackmanni type.  (July to October.)
Jackmanni... Violet-purple.
Website/Catalog  (1906)  Page(s) 69.  
 
Jackmanni, the well-known proven sort, violet-blue, is always extraordinarily faithful. 10 pieces Mk. 7.50, 100 pieces Mk. 60.-
Book  (1898)  Page(s) 65.  
 
Variétés Horticoles
Section III. — Jackmani.
Cette section renferme un grand nombre de variétés remarquables par leur vigueur, leurs tiges longuement sarmenteuses et leur rusticité.  Les fleurs, quoique plus petites que dans les sections précédentes, ont encore une bonne grandeur moyenne qui atteint de 8 à 12 centimètres de diamètre.  Le plus souvent, elles sont simples, formées de quatre à six sépales étalés en roue, rétrécis et ne se recouvrant pas à la base, puis élargis, arrondis et mucronés au sommet; la face supérieure est glabre, tandis que rinfôriciire présente; (rois nervures médianes très apparentes et est pubescentt; grisâtre, surtout dans le bouton.  Ces fleurs se montrent tantôt solitaires et axillaires, tantôt disposées en cymes dichotomes et terminales.  La floraison se prolonge plus ou moins abondante depuis juin-juillet jusqu'aux gelées.  Plusieurs variétés de ce groupe sont le produit de croisements entre les C. Viticella et C. lanuginosa.  C'est dans ce genre que l'amateur trouvera le plus sûrement des plantes présentant, avec des fleurs moyennes et abondantes, une rusticité plus grande que dans les précédentes et une vigueur telle qu'elles peuvent atteindre 4 à 5 mètres de bauteur et tapisser de grandes surfaces.
Jackmani  type (voir son origine p. 16). .  Remarquable par sa vigoureuse végétation et sa longue et abondante floraison.  La couleur des fleurs varie du violet rouge au violet bleuâtre; c'est la plus florifère de toutes les Clématites à grandes fleurs.
Magazine  (23 Feb 1884)  Page(s) 248.  
 
Home Correspondence.
Clematis Jackmanni: its Origin. — I read with amazement in last week's issue of the Gardeners' Chronicle M. Lavallée's theory as to the origin of Clematis Jackmanni and other hybrids sent out by our firm; though, as this account differs very materially from the facts, it will not be necessary to travel far to substantiate the true origin of the plants.  M. Lavallée asserts that Clematis Jackmanni is nothing more nor less than a species called Clematis hakonensis, and he then describes its characteristics thus: "Its seeds are always numerous, germinate easily, or reproduce the species almost without variation.  If the newcomers present any modification it is only in the size or colour of the sepals."  But previous to this he states the peculiarities of hybrids, thus: "When a hybrid plant is successfully raised, that is to say, a product the female parent of which belongs to a different species to that which constitutes the male parent, a plant is produced which is generally sterile, and then very inconstant.  It is, therefore, necessary to multiply such plants artificially either by cuttings or by grafts", &c.  Now, had I been asked to describe the peculiarities of the hybrid Clematis Jackmanni and its allied varieties, I could not have found words more to the point than those quoted in this latter extract, and which go to prove- were proof required- that my plants are true hybrids.  Therefore, the only conclusion at which I can arrive is that M. Lavallée is at present totally unacquainted with the true Clematis Jackmanni, rubella, and the other seedlings of the same parentage, distributed by our firm in this country.  Again, I take exception to the hypothesis that Clematis Hendersoni could not have been one of the parents of C. Jackmanni, for, as a matter of fact, we had about a dozen hybrids in the batch of seedlings that were non-climbers; these had dark purple cylindrical tubular flowers, and mostly differed from their male parent in increased size; but they were of no commercial value in comparison to those sent out.  As you appended my original statement in your last week's issue, it is not necessary to go over the ground again, but in passing I would mention that I fertilized the flowers with my own hand.  I could, after twenty years, produce confirmatory evidence, were it needed- amongst others, that of my then propagator, Thomas May, now a pensioner of the Gardeners' Benevolent Institution, who sowed the seeds, and reared the seedlings, and would corroborate what I stated in my letter of 1864.  George Jackman, Woking Nursery.
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