Book  (Oct 2001)  Page(s) 177-178.  Includes photo(s).

Book  (11 Oct 2000)  Page(s) 7-8.  
 
The first cultivar, C. 'Eriostemon', was raised in Holland in 1830 and was thought to be the result of a cross between C. integrifolia and C. viticella... ['Eriostemon' is] a tall-growing non-clinging plant, still grown in present-day gardens...

Book  (1995)  Page(s) 63.  
 
C. x eriostemon is not self-clinging and has to be frequently tied to its support.

Book  (1906)  Page(s) 56.  
 
Clematis Eriostemon (Woolly-Stamened Clematis).  N. America.  1852.  3 feet.  Flowers bluish-violet, peduncles three-flowered.  Syns. C. divaricata; C. Hendersoni (of gardens).
The leaves of this species are generally pinnate, the two or three pairs of segments are dark green and oval, the lateral ones being entire, while the terminal ones are irregularly three-lobed.