Book  (Oct 2001)  Page(s) 351-352.  Includes photo(s).

Website/Catalog  (1912)  Page(s) 78.  
 
Hybrid Clematis.
The following are Hybrid varieties raised from C. Coccinea; they have been certificated by the Horticultural Society, and are decidedly pretty and most distinct.
Sir Trevor Laurence, new, bright crimson, long campanulate flowers, re-curved, free flowering... 2s. 6d.

Website/Catalog  (1907)  Page(s) 65.  
 
Clematis in pots to plant out in spring and summer.
New Varieties.
150 Sir Trevor Lawrence, bright crimson.

Book  (1906)  Page(s) 54.  
 
Principal garden varieties of Clematis:
Viorna type.  (July to September.)
Coccinea hybrids.
Sir Trevor Lawrence... Crimson, bell-shape.