| Ulmus procera | GB, VC19 North Essex, Black Notley | George Claridge Druce | Botanical Exchange Club of The British Isles Druce Herbarium, Oxford Augustin Ley | 9/1910 | BIRM |
| Ulmus glabra | GB, VC19 North Essex, Bulmer | George Claridge Druce | Botanical Exchange Club of The British Isles Augustin Ley | 9/1907 | BIRM |
| Limonium humile | GB, VC19 North Essex, Colchester,Hythe | | George Claridge Druce George Stephen West | 8/1895 | BIRM |
| Persicaria maculosa | GB, VC19 North Essex, Fishers Green | Charles Edward Britton | Isaac A Helsby George Claridge Druce | 12/8/1928 | SLBI |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC19 North Essex, Little Maplestead | George Claridge Druce | Botanical Exchange Club of The British Isles Spencer Henry Bickham | 8/1905 | CGE |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC19 North Essex, Little Maplestead | George Claridge Druce | Botanical Exchange Club of The British Isles | 8/1905 | LIV |
+ | Mentha spicata x suaveolens = M. x villosa | GB, VC19 North Essex, Little Maplestead | George Claridge Druce | Charles Bailey | 8/1903 | MANCH |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC19 North Essex, Little Maplestead | George Claridge Druce | Botanical Exchange Club of The British Isles George Claridge Druce | 9/1922 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC19 North Essex, Little Maplestead | George Claridge Druce | George Claridge Druce | 9/1922 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC19 North Essex, Maplestead | George Claridge Druce | Druce Herbarium, Oxford | 8/1905 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC19 North Essex, Middleton | George Claridge Druce | | 9/1915 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC19 North Essex, Twinstead | George Claridge Druce | George Claridge Druce | 9/1915 | OXF |
| Sherardia arvensis | GB, VC19 North Essex, Twinstead | George Claridge Druce | Botanical Exchange Club of The British Isles William Robert Sherrin | 7/1913 | SLBI |
| Viola tricolor subsp. tricolor | GB, VC20 Hertfordshire, Albury | George Claridge Druce | Botanical Exchange Club of The British Isles Augustin Ley | 5/1904 | BIRM |
| Carex pseudocyperus | GB, VC20 Hertfordshire, Broxbourne | Joseph Edward Little | Manchester Museum Reserve Collection George Claridge Druce Mary Hayward | 18/6/1913 | MANCH |
| Juncus effusus | GB, VC20 Hertfordshire, Hertford | Ansell | Botanical Exchange Club of The British Isles George Claridge Druce Job Edward Lousley | 1928 | SLBI |
+ | Persicaria minor | GB, VC20 Hertfordshire, Hertford Heath,Goose Green | Joseph Edward Little | George Claridge Druce Joseph Edward Little Mary Hayward | 1/10/1913 | MANCH |
| Galeopsis angustifolia | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | George Claridge Druce | 8/1912 to 10/1912 | K |
| Galeopsis angustifolia | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Joseph Edward Little George Claridge Druce Ida Margaret Hayward | 28/8/1913 | K |
+ | Myosurus minimus | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | George Claridge Druce Mary Hayward | 5/1912 | MANCH |
+ | Myosurus minimus | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | George Claridge Druce Mary Hayward | 5/1912 | MANCH |
| Ajuga chamaepitys | GB, VC20 Hertfordshire, Hitchin,Wilbury Hill | Joseph Edward Little | George Claridge Druce Ida Margaret Hayward | 22/8/1912 | K |
+ | Ajuga chamaepitys | GB, VC20 Hertfordshire, Hitchin,Wilbury Hill | Joseph Edward Little | Watson Botanical Exchange Club George Claridge Druce Mary Hayward | 22/8/1912 | MANCH |
| Phleum phleoides | GB, VC20 Hertfordshire, Hitchin,Wilbury Hill | George Claridge Druce | | 7/1903 | ABS |
| Phleum phleoides | GB, VC20 Hertfordshire, Hitchin,Wilbury Hill | George Claridge Druce | George Claridge Druce Harold Stuart Thompson | 7/1904 | BIRM |
| Veronica anagallis-aquatica | GB, VC20 Hertfordshire, Marsworth | George Claridge Druce | Botanical Exchange Club of The British Isles George Claridge Druce | 7/1911 | K |
| Veronica anagallis-aquatica | GB, VC20 Hertfordshire, Marsworth | George Claridge Druce | Botanical Exchange Club of The British Isles George Claridge Druce | 7/1911 | K |
| Veronica anagallis-aquatica x catenata = V. x lackschewitzii | GB, VC20 Hertfordshire, Marsworth | George Claridge Druce | Botanical Society & Exchange Club of The British Isles George Claridge Druce | 7/1912 | MANCH |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC20 Hertfordshire, Northaw Cultivated | Charles Edgar Salmon | Charles Edgar Salmon George Claridge Druce | 9/1914 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC20 Hertfordshire, Northaw GB, VC36 Herefordshire, Ledbury Cultivated | Spencer Henry Bickham | George Claridge Druce | 20/10/1918 | LIV |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC20 Hertfordshire, Roydon | George Claridge Druce | | 9/1915 | OXF |
| Ulmus minor subsp. angustifolia | GB, VC20 Hertfordshire, Stanstead Bury | | Botanical Exchange Club of The British Isles Augustin Ley George Claridge Druce | 8/1890 | BIRM |
| Ulmus procera | GB, VC20 Hertfordshire, Stanstead Bury | George Claridge Druce | Botanical Exchange Club of The British Isles Augustin Ley | 8/1910 | BIRM |
| Mentha spicata x suaveolens = M. x villosa | GB, VC20 Hertfordshire, Stevenage | William Higgins Coleman | George Claridge Druce | 2/9/1846 | OXF |
| Persicaria lapathifolia | GB, VC20 Hertfordshire, Ware | George Claridge Druce | Herb Britannicum Oxford Job Edward Lousley | 9/1928 | SLBI |
| Persicaria lapathifolia | GB, VC20 Hertfordshire, Ware | George Claridge Druce | Botanical Exchange Club of The British Isles Richard Barker Ullman Patrick Martin Hall | 9/1928 | SLBI |
| Populus balsamifera x deltoides = P. x jackii | GB, VC20 Hertfordshire, Weston Cultivated | Joseph Edward Little | George Claridge Druce Joseph Edward Little | 31/3/1912 | MANCH |
| Senecio sarracenicus | GB, VC20 Hertfordshire, Wilstone | George Claridge Druce | William Robert Sherrin | 9/1913 | SLBI |
+ | Stellaria palustris | GB, VC21 Middlesex | George Claridge Druce | Botanical Exchange Club of The British Isles George Claridge Druce | 31/8/1910 | MANCH |
+ | Bromus interruptus | GB, VC21 Middlesex, Uxbridge | George Claridge Druce | | 7/1898 | MANCH |