| Viola arvatica | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Botanical Exchange Club of The British Isles Job Edward Lousley | 6/9/1930 | SLBI |
| Viola arvensis | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Watson Botanical Exchange Club | 7/5/1925 | SLBI |
| Viola arvensis | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 7/6/1930 | BIRM |
| Viola arvensis | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Watson Botanical Exchange Club | 7/6/1930 | SLBI |
| Viola arvensis | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 7/5/1925 | BIRM |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Watson Botanical Exchange Club | 10/1930 11/1930 | SLBI |
| Viola tricolor x arvensis = V. x contempta | GB, VC20 Hertfordshire, Great Wymondley | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 10/1930 to 11/1930 | BIRM |
| Arctium minus | GB, VC20 Hertfordshire, Gt Wymondley Springs | Joseph Edward Little | Watson Botanical Exchange Club Job Edward Lousley | 22/9/1926 | SLBI |
| Cirsium arvense | GB, VC20 Hertfordshire, Gt Wymondley Springs | Joseph Edward Little | William Hadden Beeby | 22/9/1926 | SLBI |
| Trifolium procumbens | GB, VC20 Hertfordshire, Hatfield | Joseph Edward Little | William Robert Sherrin | 18/6/1913 | 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 |
+ | Minuartia hybrida | GB, VC20 Hertfordshire, Hertfordshire,near Welbury | Joseph Edward Little | Charles Edgar Salmon | 31/7/1914 | MANCH |
| Bupleurum rotundifolium | GB, VC20 Hertfordshire, High Down | Joseph Edward Little | Watson Botanical Exchange Club Isaac A Helsby | 19/8/1926 | SLBI |
| Galium album | GB, VC20 Hertfordshire, High Down | Joseph Edward Little | Botanical Exchange Club of The British Isles Job Edward Lousley | 14/6/1927 to 20/6/1927 | SLBI |
| Acer campestre var. leiocarpum | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Joseph Edward Little | 7/12/1922 | SLBI |
| Acer campestre var. leiocarpum | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Harold Stuart Thompson | 7/12/1922 | BIRM |
| Aceras anthropophorum | GB, VC20 Hertfordshire, Hitchin | K Mears | Joseph Edward Little | 5/6/1931 | K |
| Achillea millefolium | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | | 5/12/1926 | SLBI |
| Aethusa cynapium | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | | 23/11/1922 | SLBI |
| Aethusa cynapium | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | | 8/9/1926 | SLBI |
| Ajuga reptans | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson Joseph Edward Little | 16/5/1920 | BIRM |
| Alchemilla acutiloba | GB, VC20 Hertfordshire, Hitchin Cultivated GB, VC94 Banffshire, River Fiddich | Joseph Edward Little Katherine D Little | Watson Botanical Exchange Club | 1928 23/9/1929 9/6/1930 | SLBI |
| Alchemilla pratensis | GB, VC20 Hertfordshire, Hitchin Cultivated GB, VC94 Banffshire, River Fiddich | Joseph Edward Little Katherine D Little | Watson Botanical Exchange Club | 1928 23/9/1929 9/6/1930 | SLBI |
| Alchemilla xanthochlora | GB, VC20 Hertfordshire, Hitchin Cultivated | Katherine D Little | Watson Botanical Exchange Club Harold Stuart Thompson Joseph Edward Little | 23/9/1929 | BIRM |
| Alliaria petiolata | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | | 23/7/1927 | SLBI |
| Alnus glutinosa | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | | 1/3/1927 | SLBI |
| Alnus incana | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Joseph Edward Little | 28/7/1922 | SLBI |
| Alnus incana | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | | 2/1922 | SLBI |
| Alnus incana | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson | 28/7/1922 | BIRM |
| Arenaria tenuifolia | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Joseph Edward Little | 7/9/1926 | SLBI |
| Artemisia absinthium | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | William Robert Sherrin | 5/9/1927 | SLBI |
| Atriplex patula | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Joseph Edward Little | 19/9/1914 | BIRM |
| Atriplex prostrata | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Botanical Exchange Club of The British Isles | 24/10/1927 | SLBI |
| Barbarea vulgaris | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | | 6/1925 | SLBI |
| Barbarea vulgaris var. arcuata | GB, VC20 Hertfordshire, Hitchin | | Watson Botanical Exchange Club Harold Stuart Thompson Joseph Edward Little | | BIRM |
| Barbarea vulgaris var. arcuata | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Harold Stuart Thompson Joseph Edward Little | 18/6/1915 | BIRM |
| Barbarea vulgaris | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Harold Stuart Thompson Joseph Edward Little | 24/6/1918 | BIRM |
| Brassica | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Watson Botanical Exchange Club Joseph Edward Little | 10/1924 | SLBI |
| Brassica | GB, VC20 Hertfordshire, Hitchin Cultivated | Edward Charles Wallace Joseph Edward Little | Edward Charles Wallace S A Chambers | 10/1924 | SLBI |
| Brassica napus | GB, VC20 Hertfordshire, Hitchin | Joseph Edward Little | Joseph Edward Little | 18/7/1924 | SLBI |