Website/Catalog  (1907)  Page(s) 66.  
 
Clematis in pots to plant out in spring and summer.
General Collection.
52a Louis Van Houtte (lanuginosa), violet purple.

Book  (1906)  Page(s) 52.  
 
Principal garden varieties of Clematis:
Lanuginosa type. (July to October.)
Louis van Houtte... Bluish purple.

Magazine  (Sep 1873)  Page(s) 210.  
 
Notable New Plants and Flowers.
Clematis Louis van Houtte [First-class Certificate]. — A magnificent dark variety of the lanuginosa section, the flowers being large, stout, and very striking, of a blue-purple colour. — Messrs. Cripps & Son: R.H.S., July 16.