Website/Catalog  (1931)  Page(s) 31.  
 
Clematis ... Large blooms, less vigorous climbers, approx. 8 to 15 cm bloom diameter.....Clematis Nordstern, lavender-blue, white stamens, May/June, 60 to 80 cm ...2,50 Marks [10] 22,50 [100] 200,--

Website/Catalog  (1927)  Page(s) 56.  
 
Clematis Nordstern. (G. & K.). New! Young blooms are dull violet-mauve with white stamen garland, later lavender-blue. June-July...4,-