Website/Catalog  (1966)  Page(s) 48.  
 
« Jackmani ». Fleur violette.

Website/Catalog  (1963)  Page(s) 53.  
 
Jackmani, violet.

Magazine  (1945)  Page(s) 34.  Includes photo(s).
 
Vines
Clematis Jackmani, Jackman’s Clematis.  A vine well known for its large, velvety purple flowers in late summer.  It has slender branches that climb (with support) 10 to 15 ft. and makes its best growth in loamy soil with shade over its roots.  There are many hybrid varieties.

Website/Catalog  (1932)  Page(s) 24.  
 
Clématites à grandes fleurs...Jackmani. Violet foncé, très vigoureux.

Website/Catalog  (1926)  Page(s) 55.  
 
Jackmani, pourpre violet, la meilleure, la plus rustique et la plus florifère .

Website/Catalog  (1926)  Page(s) 2.  
 
Clematis: The Queen of Climbing Plants
There is no more ornamental class of plants than Clematis, and the rich show of bloom produced by the best varieties is far too magnificent to be fairly portrayed by the best of pictures.  The flowers are of large size, measuring four to six inches and sometimes eight inches in diameter.  We presume every one of our customers who sees Clematis plants in bloom each summer promises to plant some in his own yard or garden at the next opportunity.  They are especially adapted to open lawns or house fronts in the city or country.  Perfectly hardy, bearing beautiful and lasting flowers.  The three large-flowered varieties shown in this circular are, with the small-flowered, sweet-scented Paniculata, the best varieties in cultivation.
Jackmani (Purple)
The flowers are large, intense rich velvety violet-purple, and are produced in such masses as to form a cloud of bloom.  Although introduced more than forty years ago, the Jackmani has maintained its place as the best known Clematis, with few equals and no superiors.
Cultivation
Plant in a sunny spot in good garden soil, dug very deep, placing the crown of the roots three inches below the surface of the soil.  We recommend the application of well-rotted manure in holes a few inches away from the plant in opposite directions.  The feeding roots reach out to these holes, which may be watered freely, with better success than when the manure is applied directly to the base of the plant.
Well rooted and Ripened Plants from 2½ inch Pots, $2.50 Per Dozen,  $15.00 Per Hundred 
 

Website/Catalog  (1924)  Page(s) 107.  
 
Jackmani, violet foncé, très vigoureux et florifère.

Magazine  (Sep 1920)  Page(s) 202.  
 
Planting the Home Grounds
The Use of Vines  By N. H. Ellsworth
The large-flowered varieties of clematis include a number of beautiful forms which, however, do not make a vigorous growth of vine.  When once established and blossoming freely they are a sufficient reward for much careful attention, being probably the most strikingly decorative of all vines.  There are several distinct varieties of these: Henryi is perhaps the best of the white sorts.  The familiar purple clematis is known as Jackmanni and there is a crimson sort with large attractive flowers known as Madame André. The beautiful soft pink flowers of Madame Baron Veillard are seldom seen outside of nurseries and special collections, but this variety is well worth setting out.

Website/Catalog  (1919)  Page(s) 67.  
 
Clematis Jackmanni-Hybrids....Jackmanni, purple-violet.... 10 pieces M 35.-, 100 pieces M 300.-

Magazine  (Aug 1918)  Page(s) 120.  
 
Association horticole lyonnaise Procès-verbal de l’Assemblée générale du DIMANCHE 16 JUIN 1918...
— M. F. Morel, pépiniériste à Lyon-Vaise, présente quelques tiges fleuries de Clématites à grandes fleurs, les premières en fleurs dans sa collection. Ce sont d’abord les variétés Jakmani, la plus florifère et la plus populaire de toutes, fleur d'un beau violet bleuâtre, végétation vigoureuse, longue et abondante floraison...