The climbing plant you noticed here1 during my absence & wished to learn the name of, is I believe a species of Paullinia a probably P. barbarense or curassavica2
CD had visited the Royal Botanic Society, Regent’s Park, in August, while staying with his sister-in-law, Sarah Elizabeth Wedgwood, in London (see letter to J. D. Hooker, [23 August 1864], and ‘Journal’ (Correspondence vol. 12, Appendix II)). Robinson was foreman of the herbaceous department at the Society (Gardeners’ Chronicle 3d ser. 97 (1935): 323).
Index Kewensis gives the species names as Paullinia barbadensis and P. curassavica (a synonym of P. pinnata, barbasco). CD did not give the species names in ‘Climbing plants’, but noted on page 89 that he had seen, but was unable carefully to observe, Paullinia, a tendril-bearer of the family Sapindaceae.