| Mentha spicata | GB, VC26 West Suffolk, Nayland | George Charles Brown | Botanical Exchange Club of The British Isles Charles Edward Britton George Charles Brown | | K |
| Carex divisa | GB, VC19 North Essex, Clacton-on-Sea | George Charles Brown | Botanical Exchange Club of The British Isles William Charles Barton | 5/6/1911 | BM |
| Myosurus minimus | GB, VC19 North Essex, Birch | George Charles Brown | William Robert Sherrin | 8/6/1911 | 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 divisa | GB, VC19 North Essex, Wivenhoe | George Charles Brown | Botanical Exchange Club of The British Isles William Charles Barton | 26/6/1912 | BM |
+ | 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 x spicata = M. x smithiana | GB, VC19 North Essex, Mersea Island | George Charles Brown | | 9/1912 | CGE |
+ | Silene gallica | GB, VC19 North Essex, Colchester,Hythe | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 16/6/1913 | MANCH |
| Sambucus nigra | GB, VC19 North Essex, Sible Hedingham | George Charles Brown | Botanical Exchange Club of The British Isles William Robert Sherrin | 29/6/1913 | 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 |
| Limonium vulgare | GB, VC19 North Essex, Alresford | George Charles Brown | Botanical Exchange Club of The British Isles Charles Baylis Green | 28/8/1913 | SLBI |
+ | Centaurea calcitrapa | GB, VC19 North Essex, Colchester,Hythe Quay | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 16/6/1914 | MANCH |
+ | 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 |
| 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 |
| 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 |
| 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 |
| Populus balsamifera x deltoides = P. x jackii | GB, VC26 West Suffolk, Brent Eleigh | George Charles Brown | Douglas Montague Heath Frederick Robinson | 19/8/1915 | BIRM |
| Fritillaria meleagris | GB, VC7 North Wiltshire, Oaksey | | Botanical Exchange Club of The British Isles George Charles Brown | 3/5/1916 | SLBI |
| 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 |
| Salix cinerea x aurita = S. x multinervis | GB, VC19 North Essex, Tiptree Heath | George Charles Brown | Botanical Exchange Club of The British Isles | 14/5/1916 to 13/8/1916 | CGE |
| 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 |
| Mentha arvensis x spicata = M. x gracilis | GB, VC19 North Essex, Alphamstone Cultivated | George Charles Brown | Druce Herbarium, Oxford J Fraser | 7/9/1916 | OXF |
| Carex dioica | GB, VC28 West Norfolk, Carbrooke Fen | Frederick Robinson | James Eddowes Cooper George Charles Brown | 25/5/1918 to 26/5/1918 | BM |
| 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 |
| Potamogeton lucens | VC26, Wiston | George Charles Brown | | 8/6/1919 | SLBI |
| Potamogeton polygonifolius | GB, VC19 North Essex, Tiptree Heath | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 6/5/1920 | MANCH |
| Potamogeton polygonifolius | GB, VC19 North Essex, Tiptree Heath | George Charles Brown | Botanical Exchange Club of The British Isles | 16/5/1920 | E |
| Legousia hybrida | GB, VC26 West Suffolk, Nayland | George Charles Brown | Dulwich College | 29/6/1920 | SLBI |
| Mentha arvensis x spicata = M. x gracilis | GB, VC19 North Essex, Alphamstone Cultivated | George Charles Brown | George Claridge Druce | 1/9/1920 | OXF |
| Stellaria alsine | GB, VC38 Warwickshire, Princethorpe | Linnaeus Cumming | Dulwich College George Charles Brown | 13/6/1921 | SLBI |
| Rubus nemoralis | GB, VC19 North Essex, Lexden | George Charles Brown | Botanical Exchange Club of The British Isles | 10/7/1922 | SLBI |
| Taraxacum nordstedtii | GB, VC19 North Essex, Wakes Colne | George Charles Brown | Botanical Exchange Club of The British Isles | 14/4/1923 | SLBI |
| Salix viminalis x cinerea = S. x holosericea | GB, VC19 North Essex, Berechurch | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown | 4/5/1923 to 19/8/1923 | SLBI |
| 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 |
| Carex laevigata | GB, VC19 North Essex, Middlewick | George Charles Brown | Botanical Exchange Club of The British Isles | 17/6/1923 | E |