Russell and Wilson Saunders the botanist

William Wilson Saunders

JCR had it seems an interest in botany. He arranged for the Herbarium of some 20,000 specimens which belonged to Mr. Wilson Saunders to be presented to Oxford University on Saunders' death. William Wilson Saunders FRSA 1809-79 was an underwriter at Lloyds of London, which is probably how Russell came to know him and was primarily an entomologist as well as a botanist. He was president of the Entomological Society on two occasions, 1841-1842 and 1856-1857.
See also Wikipedia entry here