| Mentha aquatica x spicata = M. x piperita | GB, VC19 North Essex, Peldon | George Charles Brown Herbert Stanley Redgrove | Druce Herbarium, Oxford | 30/8/1923 | OXF |
| Azolla filiculoides | GB, VC27 East Norfolk, Potter Heigham | George Charles Brown | Watson Botanical Exchange Club Harold Stuart Thompson National Museum of Wales | 7/1916 | BIRM |
| 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 |
| 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 |
| Althaea officinalis | GB, VC19 North Essex, Brightlingsea Cultivated | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown Job Edward Lousley | 1931 1932 | SLBI |
| Atriplex patula | GB, Lancashire, Seacoast | A Bamford | George Charles Brown | 1912 | BIRM |
| Carex divisa | GB, VC19 North Essex, Wivenhoe | George Charles Brown | Botanical Exchange Club of The British Isles Frederick Janson Hanbury George Charles Brown | 26/6/1912 | BM |
| Carex divisa | GB, VC19 North Essex, Wivenhoe | George Charles Brown | Botanical Exchange Club of The British Isles Robert Stephen Adamson | 26/6/1912 | BM |
| Carex divisa | GB, VC19 North Essex, Wivenhoe | George Charles Brown | Botanical Exchange Club of The British Isles | 26/6/1912 | E |
| Carex laevigata | GB, VC19 North Essex, Middlewick | George Charles Brown | Botanical Exchange Club of The British Isles | 17/6/1923 | E |
| Carex otrubae x remota = C. x pseudoaxillaris | GB, VC19 North Essex, Easthorpe | George Charles Brown | Botanical Exchange Club of The British Isles Frederick Janson Hanbury | 27/6/1915 | BM |
+ | Centaurea calcitrapa | GB, VC19 North Essex, Colchester,Hythe Quay | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 16/6/1914 | MANCH |
| Chenopodium opulifolium | GB, VC19 North Essex, Colchester | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown Job Edward Lousley | 28/8/1927 | SLBI |
| Cuscuta | GB, VC19 North Essex, Stanway | George Charles Brown | Botanical Exchange Club of The British Isles | 16/9/1923 | SLBI |
| Dactylorhiza fuchsii | GB, VC19 North Essex, Walton-on-the-Naze | George Charles Brown | George Charles Brown Job Edward Lousley Botanical Exchange Club of The British Isles | 26/6/1932 | SLBI |
| Dactylorhiza fuchsii | GB, VC19 North Essex, Walton on the Naze | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown | 26/6/1932 | SLBI |
| Euphorbia esula x waldsteinii = E. x pseudovirgata | GB, VC19 North Essex, Colchester | George Charles Brown | Botanical Society of The British Isles George Charles Brown Job Edward Lousley | 29/5/1927 | SLBI |
| Euphrasia nemorosa | GB, VC19 North Essex, Fordham | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown Job Edward Lousley | 27/9/1931 | SLBI |
| Festuca arundinacea | GB, VC19 North Essex, Colchester,Hythe Quay | Charles Edward Britton George Charles Brown | George Charles Brown Botanical Exchange Club of The British Isles | 4/9/1931 | K |
| Festuca arundinacea | GB, VC19 North Essex, Colchester | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown | 4/9/1931 | K |
| Fritillaria meleagris | GB, VC7 North Wiltshire, Oaksey | | Botanical Exchange Club of The British Isles George Charles Brown | 3/5/1916 | SLBI |
| 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 |
| Galium verum | GB, VC19 North Essex, Stanway | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown Job Edward Lousley | 11/7/1933 | SLBI |
| 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 |
| Lathyrus linifolius | GB, VC19 North Essex, Tiptree Heath | George Charles Brown | Botanical Exchange Club of The British Isles Job Edward Lousley | 14/5/1916 | SLBI |
| Legousia hybrida | GB, VC26 West Suffolk, Nayland | George Charles Brown | Dulwich College | 29/6/1920 | SLBI |
| Limonium binervosum | GB, VC19 North Essex, Saint Osyth | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown Job Edward Lousley | 17/7/1930 | SLBI |
| Limonium humile | GB, VC19 North Essex, Alresford | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown | 5/8/1935 | SLBI |
| Limonium vulgare | GB, VC19 North Essex, Alresford | George Charles Brown | Botanical Exchange Club of The British Isles Charles Baylis Green | 28/8/1913 | SLBI |
| Linum bienne | GB, VC19 North Essex, Rowhedge | George Charles Brown | Botanical Exchange Club of The British Isles | 17/6/1923 | SLBI |
| Medicago polymorpha | GB, VC19 North Essex, Colchester,Hythe Quay | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown | 16/8/1932 | SLBI |
| Medicago polymorpha | GB, VC19 North Essex, Colchester,Hythe Quay | George Charles Brown | Botanical Exchange Club of The British Isles | 16/8/1932 | SLBI |
| Mentha aquatica | GB, VC19 North Essex, Pebmarsh | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown Harold Stuart Thompson | 10/9/1934 | BIRM |
| 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 |
| Mentha aquatica | GB, VC19 North Essex, Pebmarsh | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown | 6/9/1934 | K |
| Mentha aquatica x spicata = M. x piperita | GB, VC19 North Essex, Colchester | George Charles Brown | Botanical Exchange Club of The British Isles | 9/8/1925 16/8/1925 | OXF |
+ | Mentha arvensis x aquatica = M. x verticillata | GB, VC19 North Essex, Liptree Heath | George Charles Brown | | 1/9/1912 | MANCH |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC19 North Essex, Tiptree Heath | George Charles Brown | Joseph Edward Little | 1/9/1912 | CGE |
| 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 |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC19 North Essex, Fingringhoe | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown Job Edward Lousley | 12/8/1926 | SLBI |