Book  (1988)  Page(s) 88, 89.  Includes photo(s).
 
Page 88: [Photo]
Page 89: A small-flowered rambler raised by Kayser and Siebert 1922. Description.

Book  (1936)  Page(s) 589.  
 
Purpurtraum (hybrid wichurana) Kayser & Seibert 1922; seedling of Excelsa; very dark purple, medium-size, semi-double, in clusters of 15-50, once-blooming, growth 8/10, climbing, 3m. Sangerhausen.

Book  (1933)  Page(s) 206.  
 
PURPURTRAUM. Kayser & Seibert, 1922. The introducers describe it as darkest of all cluster-flowering Wichuraianas. Probably red or violet.

Website/Catalog  (1928)  Page(s) 106.  
 
Climbers...Purpurtraum, carmine-cherry-red. 1 piece M 1.10, 10 pieces M 10.-, 100 pieces M 85.-

Website/Catalog  (1926)  Page(s) 38.  
 
Repeat-flowering semi-climbers. 1.5 to 2.5 m tall.
Multiflora Purpurtraum (Kaiser & Siebert). The darkest of all ramblers. Medium-size. Clusters. Moderate growth.

Book  (1926)  Page(s) 186.  
 
Purpurtraum Hybrid Wichuraiana. (Karper & Siebert [Germany]) Said to be the darkest of all climbing roses.