+ | Gentianella campestris | GB, VC59 South Lancashire, Southport | John Barrow | John Barrow | | MANCH |
| Geranium pratense | GB, VC60 West Lancashire, Silverdale | John Barrow | Charles Bailey John Barrow | 1871 | BIRM |
| Geranium sylvaticum | GB, VC69 Westmorland, Ambleside | John Barrow | Charles Bailey John Barrow | | BIRM |
| Geum rivale x urbanum = G. x intermedium | GB, VC57 Derbyshire, Buxton | John Barrow | Charles Bailey John Barrow | 29/6/1869 | MANCH |
| Geum rivale x urbanum = G. x intermedium | GB, VC57 Derbyshire, Miller's Dale | John Barrow | Charles Bailey John Barrow | 1/7/1869 | MANCH |
| Geum rivale x urbanum = G. x intermedium | GB, VC57 Derbyshire, Miller's Dale | John Barrow | Charles Bailey John Barrow | 1/7/1869 | MANCH |
| Geum rivale x urbanum = G. x intermedium | GB, VC57 Derbyshire, Miller's Dale | John Barrow | Charles Bailey John Barrow | 7/1869 | MANCH |
| Geum rivale x urbanum = G. x intermedium | GB, VC57 Derbyshire, Miller's Dale | John Barrow | John Barrow | 1/7/1869 | MANCH |
| Geum rivale x urbanum = G. x intermedium | GB, VC57 Derbyshire, Millersdale | John Barrow | Charles Bailey John Barrow | 1/7/1869 | BIRM |
+ | Gnaphalium supinum | GB, VC88 Mid Perthshire, Ben Lawers | George Horn | Charles Bailey John Barrow | 7/1869 | MANCH |
+ | Gnaphalium supinum | GB, VC90 Angus, Clova | G Lawson | Charles Bailey Isaiah Waterloo Nicholson Keys John Barrow | | MANCH |
| Gnaphalium uliginosum | GB, VC58 Cheshire, Torkington | John Barrow | Charles Bailey John Barrow | 20/7/1866 | MANCH |
+ | Habenaria albida | GB, VC57 Derbyshire, Chapel-en-le-Frith | | Charles Bailey John Barrow | 7/1841 | MANCH |
+ | Habenaria bifolia | GB, VC58 Cheshire, Torkington | | Charles Bailey John Barrow | 28/6/1866 | MANCH |
+ | Habenaria bifolia | GB, VC57,VC58, Whaley Bridge | Charles Bailey | Charles Bailey John Barrow | 2/7/1869 | MANCH |
+ | Habenaria viride | GB, VC92 South Aberdeenshire, Aberdeen | J Roy | Charles Bailey John Barrow | 25/7/1959 | MANCH |
| Helleborus viridis | GB, VC69 Westmorland, Arnside | John Barrow | John Barrow | 7/1873 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC57 Derbyshire, Buxton | Spencer Henry Bickham | Charles Bailey John Barrow | 6/1868 | MANCH |
| Helleborus viridis subsp. occidentalis | GB, VC69 Westmorland, Arnside | John Barrow | Charles Bailey John Barrow | 7/1873 | BIRM |
+ | Herminium monorchis | GB, VC6 North Somerset, Beckington | | Charles Bailey John Barrow | 6/1868 | MANCH |
| Huperzia selago | GB, VC69 Westmorland, Ambleside | John Barrow | Charles Bailey John Barrow | | BIRM |
| Hyacinthoides non-scripta | GB, VC58 Cheshire, Bramhall | | Charles Bailey John Barrow | 16/5/1868 | MANCH |
+ | Hydrocharis morsus-ranae | GB, VC59 South Lancashire, Stretford | | Charles Bailey John Barrow | 1867 | MANCH |
+ | Hymenophyllum wilsonii | GB, VC88 Mid Perthshire, Rannoch [Rannock] | | Charles Bailey John Barrow | 8/1865 | MANCH |
+ | Hymenophyllum wilsonii | IE, VCH2 North Kerry, Killarney | | Charles Bailey John Barrow | 9/1869 | MANCH |
+ | Hypericum montanum | GB, VC49 Caernarvonshire, Llandudno | John Barrow | Charles Bailey John Barrow | 14/7/1867 | MANCH |
+ | Hypochaeris maculata | GB, VC49 Caernarvonshire, Great Orme's Head | | John Barrow | 6/1868 | MANCH |
+ | Hypochaeris maculata | GB, VC49 Caernarvonshire, Llandudno,Great Orme | John Barrow | Charles Bailey | 6/6/1868 | MANCH |
+ | Iberis amara | GB, VC24 Buckinghamshire, High Wycombe | James Britten | Charles Bailey John Barrow | 7/1868 | MANCH |
+ | Illecebrum verticillatum | GB, Cornwall, Cornwall | Thomas Richard Archer Briggs | Charles Bailey Isaiah Waterloo Nicholson Keys John Barrow | 7/1866 | MANCH |
| Inula conyzae | GB, VC49 Caernarvonshire, Llandudno | Spencer Henry Bickham | Charles Bailey John Barrow | 7/1867 | MANCH |
| Jasione montana | GB, VC58 Cheshire, Hill Cliff | | Charles Bailey John Barrow | 14/7/1866 | MANCH |
+ | Lactuca saligna | GB, VC16 West Kent, Plumstead | | John Barrow | 8/1870 | MANCH |
+ | Lathyrus aphaca | GB, VC29 Cambridgeshire, Cambridge,Cherry Hinton | Francis Alfred Hanbury | London Botanical Exchange Club Charles Bailey Francis Alfred Hanbury John Barrow | 7/1862 | MANCH |
+ | Linnaea borealis | GB, VC90 Angus, Forfar (Nw of),Clova | | Charles Bailey John Barrow | 1828 | MANCH |
| Linum bienne | GB, VC113 Channel Islands, Guernsey | | Charles Bailey John Barrow | 10/8/1867 | BIRM |
| Lobelia dortmanna | GB, VC70 Cumberland, Ennerdale Lake | Frederick Addison | Charles Bailey John Barrow | 15/7/1868 | MANCH |
+ | Lobelia urens | GB, VC3 South Devon, Axminster,Kilmington | James Cosmo Melvill | Charles Bailey James Cosmo Melvill John Barrow | 1/8/1873 | MANCH |
+ | Lotus angustissimus | GB, VC113 Channel Islands, Guernsey | John Barrow | Charles Bailey | 10/8/1867 | MANCH |
+ | Lotus angustissimus | GB, VC113 Channel Islands, Guernsey | John Barrow | Charles Bailey | 10/8/1867 | MANCH |