Book  (1910)  Page(s) 231.  
 
Elegans Boursault: flowers light purplish crimson, semi-double.

Website/Catalog  (1895)  Page(s) 88.  
 
Summer Roses.
Boursault Roses.
*Elegans—Crimson, large and semi-double. 1s.

The kinds marked thus (*) are of free growth and well suited for planting in the vicinity of large towns.

Book  (1860)  Page(s) 111.  
 
Rosa alpina L. - Boursault....
Elegans, medium size, double, purple with white stripes; produces very large trusses of blooms.

Book  (1858)  Page(s) 131-2.  
 
Rosa alpina Boursaultii ....
Varietäten:
Elegans, Blume mittelgroß, gefüllt, carmoisinrosa, zuweilen purpurfarben, oft weiß gestreit, in großen Büschen blühend.

Elegans, Flower of medium size, double, crimson-pink, sometimes purplish, often streaked white, blooms in large clusters.

Magazine  (May 1849)  Page(s) 76.  
 
Boursault.... Elegans - Crimson-purple, streaked with white, showy, globular shape.

Book  (1849)  Page(s) 33, supplement.  
 
Descriptive List of Roses.
List of roses that bloom only once in the season.
Climbing Roses. Boursault Rose.
1933 Elegans...expanded bloom form. Bright purple, with white stripes.

Book  (1848)  Page(s) 13.  
 
Summer Roses, Blooming in May, June, and July.
The Alpine or Boursault Rose.
4. Elegans; flowers rosy crimson, sometimes purplish; often streaked with white; produced in very large clusters; of medium size, semi-double; form, expanded. Habit erect; growth, vigorous. A very showy pillar Rose. Continues a long time in flower, owing to the large trusses it produces, bearing buds in different stages of forwardness.

Magazine  (1847)  Page(s) 133.  
 
[Amongst climbing roses, we know of none better suited for our fair correspondent's purpose than the following :— Sempervirens.—The Garland and Felicite perpetuel. Noisettes.—Fellemberg, La Biche, and La Marque. Ayrshire.—Ruga and Dundee Rambler. Boursault.—Elegans.] 

Website/Catalog  (1846)  Page(s) 26.  
 
Boursault Roses. Rosa Alpina.
This class of Roses is distinguished by the young shoots being usually of a reddish purple hue. The varieties are also of remarkably vigorous growth, forming shoots of 12 feet or more in a season, and producing a great profusion of elegant flowers. They are perfectly hardy, as their Alpine origin would indicate. The flowers are cupped where not otherwise noted.
971. Elegans AKA Purple Boursault...Purplish crimson, white stripes, expanded, profuse clusters...50 cents.

Book  (1844)  Page(s) 74.  
 
Amadis or Elegans are the same; of rapid growth, makes a most magnificent pyramid of rich purple crimson; the flowers are produced in clusters, are perfectly double, and of considerable duration.

NB: This description is probably of 'Elegans', which was probably not the same as 'Amadis'.