| Salix viminalis x caprea = S. x smithiana | GB, VC19 North Essex, Berechurch | George Charles Brown | Botanical Society & Exchange Club of The British Isles Joseph Edward Little | 21/5/1923 to 14/8/1923 | CGE |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC19 North Essex, Berechurch | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown Job Edward Lousley | 11/7/1926 | SLBI |
| Mentha piperita var. piperita | GB, VC19 North Essex, Colchester, Middlewick Rifle Ranges | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown J Fraser | 9/8/1925 16/8/1925 | K |
+ | Silene gallica | GB, VC19 North Essex, Colchester,Hythe | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 16/6/1913 | MANCH |
+ | Centaurea calcitrapa | GB, VC19 North Essex, Colchester,Hythe Quay | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 16/6/1914 | MANCH |
| Phacelia tanacetifolia | GB, VC19 North Essex, Colchester,Hythe Quay | G C Brown | Botanical Society & Exchange Club of The British Isles G C Brown | 24/5/1934 | SLBI |
| Plantago coronopus | GB, VC19 North Essex, Colchester,Hythe Quay | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 27/9/1928 | K |
+ | Vicia lutea | GB, VC19 North Essex, Colchester,Hythe Quay | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 13/4/1926 | MANCH |
| Rubus anisacanthos | GB, VC19 North Essex, East Donyland | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 8/7/1936 | SLBI |
| Salix cinerea | GB, VC19 North Essex, East Donyland | George Charles Brown | George Charles Brown Botanical Society & Exchange Club of The British Isles | 14/3/1926 15/8/1926 | MANCH |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC19 North Essex, Easthorpe | George Charles Brown | Botanical Society & Exchange Club of The British Isles Charles Bailey | 27/6/1915 | MANCH |
| Fumaria capreolata subsp. babingtonii | GB, VC19 North Essex, Fingringhoe | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown Job Edward Lousley | 5/6/1930 | SLBI |
| Potentilla erecta x anglica = P. x suberecta | GB, VC19 North Essex, Henny | George Charles Brown | Botanical Society & Exchange Club of The British Isles Charles Bailey | 4/7/1915 | MANCH |
| Rubus criniger | GB, VC19 North Essex, Layer de la Haye | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 10/7/1938 | SLBI |
| Mentha aquatica | GB, VC19 North Essex, Pebmarsh | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 6/9/1934 | SLBI |
+ | Vicia lutea | GB, VC19 North Essex, Saint Osyth,Beacon Hill | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 5/7/1914 | MANCH |
| Viola odorata x hirta = V. x scabra | GB, VC19 North Essex, Stambourne | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 18/4/1919 | MANCH |
| Galium verum x mollugo = G. x pomeranicum | GB, VC19 North Essex, Stanway | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 30/6/1913 | MANCH |
| Rubus plicatus | GB, VC19 North Essex, Stanway | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 11/7/1933 | SLBI |
| Rubus winteri | GB, VC19 North Essex, Stanway | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 11/7/1933 | SLBI |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC19 North Essex, Tiptree Heath | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 1/9/1912 | CGE |
| Potamogeton polygonifolius | GB, VC19 North Essex, Tiptree Heath | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 6/5/1920 | MANCH |
| Mentha spicata x suaveolens = M. x villosa | GB, VC19 North Essex, West Bergholt | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown Job Edward Lousley | 10/9/1931 | SLBI |
| Ulmus campestris | GB, VC19 North Essex, Wormingford | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 22/5/1938 4/9/1938 | SLBI |
| Lamium purpureum var. hybridum | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles | 2/6/1928 | K |
| Medicago polymorpha | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles Joseph Edward Little | 8/1928 to 9/1928 | SLBI |
| Veronica persica var. kochiana | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles J Fraser | 7/10/1932 | K |
| Rumex pulcher | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles Job Edward Lousley | 26/7/1923 to 17/9/1923 | SLBI |
| Salix caprea x aurita = S. x capreola | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles Joseph Edward Little | 4/8/1922 16/3/1923 29/3/1924 28/6/1924 | MANCH |
| Salix pentandra x fragilis = S. x meyeriana | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles | 22/5/1924 14/8/1924 | MANCH |
| Veronica agrestis | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles Job Edward Lousley | | SLBI |
| Veronica agrestis | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles | 30/4/1930 | K |
| Veronica agrestis | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles Job Edward Lousley | 30/4/1930 | SLBI |
| Veronica agrestis | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles Charles Edward Britton | 3/5/1930 | K |
| Veronica agrestis | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles | 16/11/1932 | K |
| Veronica persica var. corrensiana | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles J Fraser | 9/1932 10/1932 | K |
| Viola reichenbachiana | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles Charles Bailey Joseph Edward Little | 6/5/1917 3/6/1917 | MANCH |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles Job Edward Lousley | 9/1930 10/1930 11/1930 | SLBI |
+ | Salix viminalis x caprea x cinerea = S. x calodendron | GB, VC20 Hertfordshire, Ickleford | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles Willis Openshaw Howarth | 2/11/1923 to 16/5/1924 | MANCH |
| Salix caprea x cinerea = S. x reichardtii | GB, VC20 Hertfordshire, Ippolyts Common | Joseph Edward Little | Botanical Society & Exchange Club of The British Isles | 14/4/1924 to 18/7/1924 | MANCH |