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.  
Magnifica, purple shaded crimson...  1s. 6d.

Website/Catalog  (1907)  Page(s) 66.  
 
Clematis in pots to plant out in spring and summer.
General Collection.
60 Magnifica (Jackmanii), reddish purple.

Book  (1907)  Page(s) 144.  
 
It is a matter of interest that hybrid clematis may be grown in beds, and in this case require to be trained over hoops to 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.)
Magnifica... Reddish-purple, red bar.

Book  (1904)  Page(s) 330-1.  
 
Other hybrids or varieties of C. Jackmani are: Var. magnifica, Jackman (C. magnifica, Hort.), rich purple, shaded with crimson, 3 bars of red in each sepal.

Book  (1898)  Page(s) 66.  
 
Variétés Horticoles
1er Groupe.—PATENS
Section III. — Jackmani.
Magnifica (Jackman).  Fleur rouge violacé teinté pourpre.

Magazine  (1884)  Page(s) 142.  
 
Magnifica. Reddish violet with red middle stripes, VII-X.

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) 170, 260.  
 
p. 170: Clematis Viticella L. var. magnifica, Rev. hort., p. 110, avec pl. col. — Cette var. sort des cultures de M. Jackman, de Woking (Angleterre) : elle est vigoureuse, ses tiges deviennent sous-frutescentes et ses fleurs durent plusieurs semaines. Les fleurs sont très-grandes, formées de 4, parfois de 5 pétales épais, d’un violet foncé ; chaque pétale porte une bande plus accentuée de pourpre.

p. 260: Magnifica. — Fl. Mag., 1869, pl. 453.

Magazine  (1877)  Page(s) 261, 270.  
 
p. 261: CI. Vitic. magnifica. — Rev. hort., 1876, 110, c. ic. col.

p. 270: Clematis magnifica (Jackman); pourpre.