Magazine  (1877)  Page(s) 270.  
 
Clematis maritima plena (Billiard).

Book  (1872)  Page(s) 125.  
 
C. MARITIMA PLENA (Billiard) .- A fine ornamental hardy herbaceous perennial, with the general habit, aspect, and foliage of the type. The flowers differ in being semi-double ; they are pure white, and disposed in broad paniculate masses at the terminations of the stems. It was raised in the nursery of M. Billiard, at Fontenay-aux-Roses, and is said to be remarkably effective in its flowering season-June.