| Galeopsis angustifolia | GB, VC9 Dorset, Steepleton | | Lester Vallis Lester-Garland | 1893 | K |
| Galeopsis angustifolia | GB, VC9 Dorset, Swanage | | Lester Vallis Lester-Garland | 8/1902 | K |
| Galeopsis angustifolia | GB, VC22 Berkshire, Faringdon | | Lester Vallis Lester-Garland | 14/7/1913 | K |
| Galeopsis angustifolia | GB, VC57 Derbyshire, Dove Dale [Dovedale] | Augustin Ley | Lester Vallis Lester-Garland | 27/8/1895 | K |
| Galeopsis segetum | GB, VC49 Caernarvonshire, Bangor | John Edwards Griffith | Watson Botanical Exchange Club Lester Vallis Lester-Garland | 1900 30/8/1901 | K |
| Galeopsis segetum | GB, VC49 Caernarvonshire, Bangor | John Edwards Griffith | Lester Vallis Lester-Garland | 10/1895 | K |
| Galeopsis tetrahit | GB, VC22 Berkshire, Godstow | | Lester Vallis Lester-Garland | 18/8/1895 | K |
| Galeopsis tetrahit | GB, VC23 Oxfordshire, Godstow | | Lester Vallis Lester-Garland | 1892 | K |
| Galeopsis tetrahit | GB, VC99 Dunbartonshire, Ardlui | | Lester Vallis Lester-Garland | 12/9/1919 | K |
| Galeopsis tetrahit | GB, VC113 Channel Islands, Jersey,Rozel | | Lester Vallis Lester-Garland | 15/7/1898 | K |
| Galeopsis versicolor | GB, VC48 Merionethshire, Pennal | Lester Vallis Lester-Garland | Lester Vallis Lester-Garland | 3/9/1922 | K |
| Galeopsis versicolor | GB, VC53 South Lincolnshire, Swinderby | | Lester Vallis Lester-Garland | 6/9/1912 | K |
| Galeopsis versicolor | GB, VC98 Argyllshire, Kilcheran Cultivated | Lester Vallis Lester-Garland | Lester Vallis Lester-Garland | 3/9/1919 | K |
| Geranium purpureum | GB, VC113 Channel Islands, Jersey, Saint Ouen's | Lester Vallis Lester-Garland | Botanical Exchange Club of The British Isles Augustin Ley | 25/5/1899 | BIRM |
| Geranium purpureum | GB, VC113 Channel Islands, Jersey, Saint Ouen's | Lester Vallis Lester-Garland | Botanical Exchange Club of The British Isles Edward Francis Linton William Hunt Painter William Richardson Linton | 21/5/1899 | ABS |
| Glebionis segetum | GB, Wiltshire, Bromham | | Lester Vallis Lester-Garland | 22/8/1894 | K |
| Glebionis segetum | GB, VC113 Channel Islands, Jersey, Saint Brelade | | Lester Vallis Lester-Garland | 13/6/1900 | K |
| Glechoma hederacea | GB, VC17 Surrey, Saint Martha | | Lester Vallis Lester-Garland | 17/8/1918 | K |
| Glechoma hederacea | GB, VC19,VC20, Birchanger | | Lester Vallis Lester-Garland | 4/6/1922 | K |
| Glechoma hederacea | GB, VC23 Oxfordshire, Summertown | | Lester Vallis Lester-Garland | 6/1884 | K |
| Glechoma hederacea | GB, VC23 Oxfordshire, Wood Eaton | | Lester Vallis Lester-Garland | 29/4/1895 | K |
| Glechoma hederacea | GB, VC113 Channel Islands, Jersey | | Lester Vallis Lester-Garland | 24/5/1901 | K |
| Glechoma hederacea | GB, VC113 Channel Islands, Saint Saviours Valley | | Lester Vallis Lester-Garland | 28/4/1900 | K |
| Gnaphalium undulatum | GB, VC113 Channel Islands, Jersey | Lester Vallis Lester-Garland | Botanical Exchange Club of The British Isles Charles Bailey | 7/1897 | MANCH |
| Gnaphalium undulatum | GB, VC113 Channel Islands, Jersey | Lester Vallis Lester-Garland | Botanical Exchange Club of The British Isles Augustin Ley | 1897 | BIRM |
| Groenlandia densa | GB, VC5 South Somerset, Templecombe | Lester Vallis Lester-Garland | | 16/7/1894 | K |
| Habenaria viride | | R L | Lester Vallis Lester-Garland | 8/1926 | K |
| Habenaria viride | GB, VC14 East Sussex, Firle Beacon | W Biddiscombe | Botanical Exchange Club of The British Isles Lester Vallis Lester-Garland | 8/1922 | K |
| Herminium monorchis | GB, VC33 East Gloucestershire, Painswick | | Lester Vallis Lester-Garland | 12/8/1926 | K |
| Herminium monorchis | GB, VC34 West Gloucestershire, Selsley Hill | Edward Francis Linton | Lester Vallis Lester-Garland | 3/7/1894 | K |
| Hieracium umbellatum subsp. bichlorophyllum | GB, VC113 Channel Islands, Jersey | Lester Vallis Lester-Garland | Allan Octavian Hume E F & W R Linton | 17/7/1901 | SLBI |
| Hieracium umbellatum subsp. bichlorophyllum | GB, VC113 Channel Islands, Jersey | Lester Vallis Lester-Garland | Allan Octavian Hume E F & W R Linton | 17/7/1901 | SLBI |
| Hordeum marinum | GB, VC25 East Suffolk, Walberswick | | Lester Vallis Lester-Garland | 25/8/1920 | K |
| Hypochaeris glabra | GB, VC3 South Devon, Exmouth | William Moyle Rogers | Lester Vallis Lester-Garland | 1/8/1877 | K |
| Hypochaeris glabra | GB, VC19 North Essex, Berechurch | Edward Francis Linton | Lester Vallis Lester-Garland | | K |
| Hypochaeris glabra | GB, VC25 East Suffolk, Southwold | | Lester Vallis Lester-Garland | 26/8/1920 | K |
| Hypochaeris glabra | GB, VC113 Channel Islands, Portelet Bay, Jersey | | Lester Vallis Lester-Garland | 30/5/1898 | K |
| Hypochaeris glabra | GB, VC113 Channel Islands, Portelet Bay, Jersey | | Lester Vallis Lester-Garland | 4/6/1898 | K |
| Hyssopus officinalis | CH | | Lester Vallis Lester-Garland | | K |
| Hyssopus officinalis | GB, VC11 South Hampshire, Beaulieu Abbey GB, VC36 Herefordshire, Ledbury Cultivated | Spencer Henry Bickham | Botanical Exchange Club of The British Isles Lester Vallis Lester-Garland Spencer Henry Bickham | 21/7/1919 | K |