Book  (Oct 2001)  Page(s) 258-259.  Includes photo(s).

Book  (1999)  Page(s) 236.  Includes photo(s).
 
...lavender-blue flowers

Book  (1999)  Page(s) 130.  
 
Clematis 'Lasurstern', cv., 1952

Website/Catalog  (1919)  Page(s) 67.  
 
Clematis Jackmanni-Hybrids....Lasurstern, excellent novelty of blue colour and fine form.... 10 pieces M 35.-, 100 pieces M 300.-

Website/Catalog  (1914)  Page(s) 109.  
 
Large Flowering Clematis
Azure Star. (Lasurstern) A new variety with large blue flowers. Strong grower and very desirable.

Website/Catalog  (1909)  Page(s) 3.  Includes photo(s).
 
New and rare plants. Clematis 'Lasurstern' (G. & K).
Magnificent deep blue is the 6-8 tepalled bloom star,  in the centre of which a bundle of white beams of stamens stand out in bright sharp colour effect. The numerous blooms have a diameter of 16 cm and are strung together bloom to bloom, and as they bloom on the previous year's canes, this magnificent new sort is also suitable for forcing. 1 piece Mk. 1.50, 10 pieces Mk. 12.50

Website/Catalog  (1906)  Page(s) 3, 68.  Includes photo(s).
 
Clematis "Lasurstern" (G & K 1906).
 Magnificent deep blue is the 5-6 tepalled bloom star, in the centre of which a bundle of white beams of stamens stand out in bright sharp colour effect. The numerous blooms have a diameter of 10 cm even in young plants. This novelty belongs to the Patens-Class. 1 piece Mk. [Mark] 3.-, 10 pieces Mk. 25.-