Book  (Oct 2001)  Page(s) 219-220.  Includes photo(s).

Magazine  (30 Jul 1892)  Page(s) 73.  
 
Clematis angustifolia Jacq., de l’Europe centrale; fleurs blanches.

Magazine  (1839)  Page(s) pl. 61.  
 
[From the text to C. lathyrifolia]
The two common hardy herbaceous plants, Clematis erecta and angustifolia, although placed at a great distance from each other in M. DeCandolle's distribution of the genus, are nevertheless so nearly related that there can be no doubt of their immediate affinity. In fact they cannot be distinguished by the characters given them in the Prodromus, which are almost equally applicable to either. C. angustifolia is said to have one flower only on a common stalk, which is never the case in the garden specimens, neither do I find it so in my wild specimens of the supposed variety C. lasiantha from Dahuria. The real distinction between them consists, as Reichenbach has well observed, in the narrow leaves and hairy carpels of one, as compared with the broad ovate leaves and smooth carpels of the other.

Book  (1834)  Page(s) 72.  
 
Clematis L. ...Erectae ...
angustifolia Jacq. Rar. t. 104.
 

Website/Catalog  (1826)  Page(s) 81.  
 
Plantes herbacées de pleine terre...
CLEMATIS
angustifolia.

Website/Catalog  (1824)  Page(s) 19.  
 
Clematis
13. Augustifolia

Magazine  (1824)  Page(s) tab 918.  Includes photo(s).
 
Clematis angustifolia. This is a herbaceous species: it grows to the height of three feet: the flowers are clear White, large, smooth within, and wooly on the outside. We raised this under the Name of lasiantha, from seeds communicated by our highly esteemed friend Dr. Fischer, Director of the Imperial Botanic Garden of St. Petersburg; an Institution which under ist able Management, and supported by the munificence of the Emperor, bids fair to outvie similar Establishments, in far less inhospitable climates. Our plant agrees exactly with the description angustifolia of Decandolle.
It is a native of Siberia round Mount Argun, according to Pallas, and beyond Baikal lake, according to Dmelin.
It is perfectly hardy, and will grow in any good garden soil. It may sometimes be increased by separating the roots, not having yet ripened its seeds in this country.

Book  (1820)  Page(s) 25.  
 
Clematis angustifolia. Perennial. Hardy .... 12 Groschen
C. hexapetala.