Magazine  (Jan 1887)  Page(s) 15.  
 
Patens-Class ....Calypso (Lem.) large, sky-blue

Magazine  (1877)  Page(s) 367.  
 
Clematis Calypso (Lemoine); bleu.

Book  (1872)  Page(s) 158.  
 
C. CALYPSO (Lemoine) .-This variety belongs to the patens group, and resembles that type in its habit of growth, and in its ternate leaves. The flowers are of fine form, consisting of eight elongated sepals, symmetrically arranged in two whorls, and of an azure-blue colour.