Book  (1936)  Page(s) 210.  
 
Diener's Blue (multiflora) Diener 1926; naphta-violet, 5 cm., very double, in large clusters, growth 7/10, climbing

Book  (1933)  Page(s) 172.  
 
DIENER'S BLUE. R. Diener, 1926. Another attempt at a blue rose. Multiflora of Veilchenblau type.