| Atriplex patula | GB, Lancashire, Seacoast | A Bamford | George Charles Brown | 1912 | BIRM |
| 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 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 |
| 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 |
| Carex dioica | GB, VC28 West Norfolk, Carbrooke Fen | Frederick Robinson | James Eddowes Cooper George Charles Brown | 25/5/1918 to 26/5/1918 | BM |
| 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 |
| 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 William Charles Barton | 26/6/1912 | BM |
| 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 |
| 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 |
| 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 |
| 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 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 |
| Potamogeton polygonifolius | GB, VC19 North Essex, Tiptree Heath | George Charles Brown | Botanical Exchange Club of The British Isles | 16/5/1920 | E |
| Festuca arundinacea | GB, VC19 North Essex, Colchester | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown | 4/9/1931 | K |
| 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 |
| 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 arvensis x aquatica x spicata = M. x smithiana | GB, VC19 North Essex, Alphamstone | George Charles Brown | Botanical Society & Exchange Club of The British Isles George Charles Brown | 26/8/1928 | K |
| 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 |
| Mentha spicata | GB, VC26 West Suffolk, Nayland | George Charles Brown | Botanical Exchange Club of The British Isles Charles Edward Britton George Charles Brown | | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC19 North Essex, West Bergholt | George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown | 10/9/1931 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC19 North Essex, West Bergholt | George Charles Brown | George Charles Brown J Fraser | 10/9/1931 | K |
| Plantago coronopus | GB, VC19 North Essex, Colchester,Hythe Quay | Charles Edward Britton George Charles Brown | Botanical Exchange Club of The British Isles George Charles Brown | 27/9/1928 | K |
| 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 |
| Verbascum virgatum | GB, VC19 North Essex, Colchester | George Charles Brown | | 7/1935 | K |
| 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 |
+ | Centaurea calcitrapa | GB, VC19 North Essex, Colchester,Hythe Quay | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 16/6/1914 | 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 |
+ | Mentha arvensis x aquatica = M. x verticillata | GB, VC19 North Essex, Liptree Heath | George Charles Brown | | 1/9/1912 | MANCH |
| Potamogeton polygonifolius | GB, VC19 North Essex, Tiptree Heath | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 6/5/1920 | 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 |
+ | Primula elatior | GB, VC19 North Essex, Essex, Hatfield-Broad-Oak, Hatfield Forest | George Charles Brown | Frederick Ernest Weiss | 13/4/1925 | MANCH |
| 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 |
+ | Silene gallica | GB, VC19 North Essex, Colchester,Hythe | George Charles Brown | Botanical Society & Exchange Club of The British Isles | 16/6/1913 | MANCH |
+ | 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 |
+ | 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 |