| Geum rivale x urbanum = G. x intermedium | GB, VC77 Lanarkshire, Bothwell | Richard McKay | Charles Bailey Frederick Thompson Mott | 6/1872 | MANCH |
| Glechoma hederacea | GB, VC6 North Somerset, Bath | Frederick Thompson Mott | | 20/5/1887 | SLBI |
| Glyceria fluitans x notata = G. x pedicellata | GB, VC38 Warwickshire, Nuneaton | | Manchester Museum Charles Bailey Frederick Thompson Mott Thomas Thorp | 12/1883 | MANCH |
| Glyceria fluitans x notata = G. x pedicellata | GB, VC55 Leicestershire, Belgrave | Frederick Thompson Mott | | | MANCH |
| Glyceria fluitans x notata = G. x pedicellata | GB, VC55 Leicestershire, Croft | | Manchester Museum Charles Bailey Frederick Thompson Mott Thomas Thorp | 8/1898 | MANCH |
+ | Gnaphalium luteoalbum | GB, VC113 Channel Islands, Jersey,Le Marais | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 8/1895 | MANCH |
+ | Gnaphalium sylvaticum | GB, VC55 Leicestershire, Donington Park, Castle Donington | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 1885 | MANCH |
+ | Gnaphalium sylvaticum | GB, VC55 Leicestershire, Nailstone Wiggs | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 12/7/1882 | MANCH |
+ | Gnaphalium sylvaticum | GB, VC55 Leicestershire, Nailstone Wiggs | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 14/9/1892 | MANCH |
+ | Gnaphalium sylvaticum | GB, VC58 Cheshire, Birkenhead | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 8/1846 | MANCH |
+ | Gnaphalium sylvaticum | GB, VC87 West Perthshire, Ben Ledi | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 8/1821 | MANCH |
+ | Gnaphalium sylvaticum | GB, VC98 Argyllshire, Oban (E of),Dalmally | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 9/1889 | MANCH |
| Gnaphalium uliginosum | GB, VC55 Leicestershire, Bury Camp, Ratby | Frederick Thompson Mott | Charles Bailey Frederick Thompson Mott Thomas Thorp | 10/1873 | MANCH |
| Gnaphalium uliginosum | GB, VC55 Leicestershire, Leicester | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 7/1843 | MANCH |
+ | Groenlandia densa | GB, VC28 West Norfolk, Dersingham Fen | Frederick Thompson Mott | Charles Bailey Frederick Thompson Mott Thomas Thorp | 8/1884 | MANCH |
+ | Groenlandia densa | GB, VC55 Leicestershire, Croft | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 7/1878 | MANCH |
+ | Groenlandia densa | GB, VC55 Leicestershire, Croft | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 13/6/1883 | MANCH |
+ | Groenlandia densa | GB, VC55 Leicestershire, Leicester, Evington | Edgar Franklin Cooper | Charles Bailey Frederick Thompson Mott Thomas Thorp | 7/1898 | MANCH |
+ | Groenlandia densa | GB, VC55 Leicestershire, Thurmaston | Frederick Thompson Mott | Charles Bailey Frederick Thompson Mott | 6/1885 | MANCH |
+ | Habenaria bifolia | GB, VC28 West Norfolk, Hunstanton | Edgar Franklin Cooper | Charles Bailey Frederick Thompson Mott Thomas Thorp | 7/1876 | MANCH |
+ | Habenaria bifolia | GB, VC62 North-east Yorkshire, Strensall Common | | Charles Bailey Frederick Thompson Mott | 7/9/1881 | MANCH |
+ | Habenaria bifolia | GB, Wales,North Wales | Pattison | Charles Bailey Frederick Thompson Mott Thomas Thorp | 6/1897 | MANCH |
+ | Habenaria viride | GB, VC14 East Sussex, Lewes | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 8/1872 | MANCH |
+ | Habenaria viride | GB, VC33 East Gloucestershire, Painswick | Leonard Mott | Charles Bailey Frederick Thompson Mott Leonard Mott Thomas Thorp | 7/1889 | MANCH |
+ | Habenaria viride | GB, VC55 Leicestershire, Bradgate | | Charles Bailey Frederick Thompson Mott Thomas Thorp | | MANCH |
+ | Habenaria viride | GB, VC55 Leicestershire, Brentingby | Frederick Thompson Mott | Charles Bailey Frederick Thompson Mott Thomas Thorp | 22/6/1887 | MANCH |
+ | Habenaria viride | GB, VC57 Derbyshire, Matlock | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 7/1843 | MANCH |
+ | Helianthemum apenninum | GB, VC3 South Devon, Torquay | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 6/1853 | MANCH |
+ | Helianthemum apenninum | GB, VC6 North Somerset, Brean Down | Giles Owen | Charles Bailey Frederick Thompson Mott Thomas Thorp | 7/1894 | MANCH |
+ | Helianthemum apenninum | GB, VC6 North Somerset, Brean Down | Thomas Arthur Preston | Charles Bailey Frederick Thompson Mott Thomas Thorp | 5/1896 | MANCH |
| Helleborus foetidus | GB, VC6 North Somerset, Bath | Frederick Thompson Mott | Charles Bailey Frederick Thompson Mott | 1894 | MANCH |
| Helleborus foetidus | GB, VC65 North-west Yorkshire, Langwith | Philip M Sewell | Frederick Thompson Mott | 1883 | MANCH |
| Helleborus viridis | GB, VC55 Leicestershire, Allexton | J Norris | Frederick Thompson Mott Charles Bailey Thomas Thorp | 3/1890 | MANCH |
| Helleborus viridis | GB, VC55 Leicestershire, Birstal Hill garden Cultivated | Frederick Thompson Mott | Manchester Museum Charles Bailey Frederick Thompson Mott Thomas Thorp | 2/4/1893 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC7 North Wiltshire, Monkton Farleigh | Frederick Thompson Mott | Charles Bailey Frederick Thompson Mott Thomas Thorp | 3/1893 | MANCH |
+ | Herminium monorchis | GB, VC17 Surrey, Dorking,Box Hill | William Hadden Beeby | Charles Bailey Frederick Thompson Mott Thomas Thorp | 10/1873 | MANCH |
+ | Herminium monorchis | GB, VC33 East Gloucestershire, Cheltenham | J Plant | Charles Bailey Frederick Thompson Mott J Plant Thomas Thorp | 6/1889 | MANCH |
| Hieracium spilophaeum | GB, VC6 North Somerset, Bath | Frederick Thompson Mott | | 26/6/1893 | SLBI |
+ | Hordeum marinum | GB, VC28 West Norfolk, Hunstanton | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 8/1884 | MANCH |
+ | Hordeum marinum | GB, VC49 Caernarvonshire, Llandudno | | Charles Bailey Frederick Thompson Mott Thomas Thorp | 7/1888 | MANCH |