Book  (Oct 2001)  Page(s) 217-218.  Includes photo(s).

Book  (1999)  Page(s) 235.  
 
...white with a touch of cream...brown anthers

Book  (1999)  Page(s) 130.  
 
Clematis 'Henryi', cv., 1952

Book  (Apr 1998)  Page(s) 128.  

Book  (31 Oct 1993)  Page(s) 106.  Includes photo(s).

Magazine  (28 Jul 1937)  Page(s) 56.  
 
TWENTY BEST LARGE-FLOWERED HYBRIDS OBTAINABLE IN THIS COUNTRY
Henryi,  white, Lanuginosa Type
All bloom on new wood except Belle of Woking and Sir Garnet Wolseley

Magazine  (Jul 1937)  Page(s) 105.  
 
Dans certaines sections, celle des « Clémalis Lanuginosa » notamment les fleurs atteignent une grande ampleur, jusqu’à 20 cm. chez les variétés : Lawsoniana, Henryi, Jeanne d’Arc.

Website/Catalog  (1926)  Page(s) 55.  
 
Bangholm bell, blanc pur.

Website/Catalog  (1926)  Page(s) 2.  Includes photo(s).
 
Clematis: The Queen of Climbing Plants
There is no more ornamental class of plants than Clematis, and the rich show of bloom produced by the best varieties is far too magnificent to be fairly portrayed by the best of pictures.  The flowers are of large size, measuring four to six inches and sometimes eight inches in diameter.  We presume every one of our customers who sees Clematis plants in bloom each summer promises to plant some in his own yard or garden at the next opportunity.  They are especially adapted to open lawns or house fronts in the city or country.  Perfectly hardy, bearing beautiful and lasting flowers.  The three large-flowered varieties shown in this circular are, with the small-flowered, sweet-scented Paniculata, the best varieties in cultivation.
Henryi (White)
A vigorous grower and a free bloomer, producing its large pure white flowers constantly during summer and early autumn.  The best large-flowered pure white variety.
Cultivation
Plant in a sunny spot in good garden soil, dug very deep, placing the crown of the roots three inches below the surface of the soil.  We recommend the application of well-rotted manure in holes a few inches away from the plant in opposite directions.  The feeding roots reach out to these holes, which may be watered freely, with better success than when the manure is applied directly to the base of the plant.
Well rooted and Ripened Plants from 2½ inch Pots, $2.50 Per Dozen,  $15.00 Per Hundred 
 

Magazine  (Sep 1920)  Page(s) 202.  
 
Planting the Home Grounds
The Use of Vines  By N. H. Ellsworth
The large-flowered varieties of clematis include a number of beautiful forms which, however, do not make a vigorous growth of vine.  When once established and blossoming freely they are a sufficient reward for much careful attention, being probably the most strikingly decorative of all vines.  There are several distinct varieties of these: Henryi is perhaps the best of the white sorts.  The familiar purple clematis is known as Jackmanni and there is a crimson sort with large attractive flowers known as Madame André. The beautiful soft pink flowers of Madame Baron Veillard are seldom seen outside of nurseries and special collections, but this variety is well worth setting out.