| Acer campestre | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Watson Botanical Exchange Club Allan Octavian Hume Frances Louisa Foord-Kelcey | 18/6/1905 | SLBI |
| Alchemilla filicaulis | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Allan Octavian Hume | 11/6/1905 | SLBI |
| Arenaria serpyllifolia subsp. lloydii | GB, VC54 North Lincolnshire, Skegness | Arthur Reginald Horwood | William Robert Sherrin | 6/1905 | SLBI |
| Betula pendula | GB, VC27 East Norfolk, Holt | Arthur Reginald Horwood | Dulwich College | 9/1915 | SLBI |
| Capsella bursa-pastoris | GB, VC55 Leicestershire, Kibworth | M E Whitton | Watson Botanical Exchange Club William Robert Sherrin Arthur Reginald Horwood | 10/12/1915 | SLBI |
| Capsella bursa-pastoris | GB, VC55 Leicestershire, Kibworth | M E Whitton | Watson Botanical Exchange Club Arthur Reginald Horwood William Robert Sherrin | 10/12/1915 | SLBI |
| Capsella bursa-pastoris | GB, VC55 Leicestershire, Kibworth | M E Whitton | Watson Botanical Exchange Club Arthur Reginald Horwood William Robert Sherrin | 10/12/1915 | SLBI |
| Chenopodium album var. viride | GB, VC55 Leicestershire, Humberstone | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood William Robert Sherrin | 16/8/1906 | SLBI |
| Chenopodium album | GB, VC55 Leicestershire, Humberstone | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood William Robert Sherrin | 16/8/1906 | SLBI |
| Euphrasia nemorosa | GB, VC55 Leicestershire, South Croxton | Arthur Reginald Horwood | Alfred Loydell William Robert Sherrin | 8/1905 | SLBI |
| Euphrasia nemorosa | GB, VC55 Leicestershire, Waltham | Arthur Reginald Horwood | National Museum of Wales Watson Botanical Exchange Club Job Edward Lousley | 19/8/1916 | SLBI |
| Glechoma hederacea | GB, VC55 Leicestershire, Lowesby | Arthur Reginald Horwood | Watson Botanical Exchange Club Allan Octavian Hume | 21/5/1905 | SLBI |
| Glechoma hederacea | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Watson Botanical Exchange Club William Robert Sherrin | 14/5/1905 | SLBI |
| Matricaria discoidea | GB, VC55 Leicestershire, Kirby Muxloe | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood William Robert Sherrin | 1/7/1909 | SLBI |
| Myosotis arvensis var. umbrosa | GB, VC55 Leicestershire, South Croxton | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood William Robert Sherrin | 30/8/1906 | SLBI |
| Petroselinum segetum | GB, VC55 Leicestershire, Hungerton | Arthur Reginald Horwood | Arthur Reginald Horwood William Robert Sherrin | 8/8/1906 | SLBI |
| Plantago major | GB, VC55 Leicestershire, Cropston Reservoir | Arthur Reginald Horwood | Watson Botanical Exchange Club Allan Octavian Hume | 22/6/1905 | SLBI |
| Poterium sanguisorba subsp. balearicum | GB, VC55 Leicestershire, Dunckley Hill, Rutland | Arthur Reginald Horwood | National Museum of Wales | 8/1916 | SLBI |
| Salix alba subsp. vitellina | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Botanical Society & Exchange Club of The British Isles National Museum of Wales | 8/1926 | SLBI |
| Tragopogon pratensis | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood | 22/6/1905 | SLBI |
| Trifolium pratense | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood William Robert Sherrin | 22/6/1905 | SLBI |
| Valerianella eriocarpa | GB, VC54 North Lincolnshire, Skegness | Arthur Reginald Horwood | Dulwich College | 6/1905 | SLBI |
| Veronica anagallis-aquatica subsp. divaricata | GB, VC32 Northamptonshire, Helpston | Arthur Reginald Horwood | Watson Botanical Exchange Club | 8/1916 | SLBI |
| Viburnum opulus var. flava | GB, VC55 Leicestershire, Narborough Bog | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood | 10/1915 | SLBI |
| Viola ruralis | GB, VC55 Leicestershire, Normanton | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Arthur Reginald Horwood | 21/5/1915 | SLBI |
+ | Blysmus compressus | GB, VC55 Leicestershire, King's Norton | Arthur Reginald Horwood | Arthur Reginald Horwood Charles Bailey | 1/9/1909 | MANCH |
| Carduus crispus x nutans = C. x stangii | GB, VC55 Leicestershire, Lowesby | Arthur Reginald Horwood | Watson Botanical Exchange Club Charles Bailey | 8/7/1905 | MANCH |
| Carduus crispus x nutans = C. x stangii | GB, VC55 Leicestershire, Lowesby | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Charles Bailey | 8/7/1905 | MANCH |
+ | Chenopodium murale | GB, VC56 Nottinghamshire, Trent Meadows | Arthur Reginald Horwood | | 1896 | MANCH |
| Daphne laureola | GB, VC55 Leicestershire, Kirby Muxloe | G Wilshere | Watson Botanical Exchange Club Arthur Reginald Horwood | 26/1/1916 | MANCH |
| Festuca pratensis x Lolium perenne = x Festulolium loliaceum | GB, VC55 Leicestershire, Aylestone | Arthur Reginald Horwood | Watson Botanical Exchange Club Charles Bailey | 1/7/1905 | MANCH |
| Glyceria fluitans x notata = G. x pedicellata | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood Charles Bailey | 15/7/1906 | MANCH |
| Glyceria fluitans x notata = G. x pedicellata | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Watson Botanical Exchange Club Charles Bailey | 28/6/1905 | MANCH |
+ | Juncus compressus | GB, VC55 Leicestershire, Cropston | Arthur Reginald Horwood | Watson Botanical Exchange Club Charles Bailey | 28/7/1910 | MANCH |
| Quercus petraea x robur = Q. x rosacea | GB, VC55 Leicestershire, Stoughton | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood Charles Bailey | 9/1907 | MANCH |
| Salix viminalis x cinerea = S. x holosericea | GB, VC55 Leicestershire, Hungarton,Quenby | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Arthur Reginald Horwood | 14/8/1906 4/1907 | MANCH |
| Salix viminalis x cinerea = S. x holosericea | GB, VC55 Leicestershire, Quenby | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Arthur Reginald Horwood | 4/1907 to 14/8/1907 | MANCH |
| Salix viminalis x cinerea = S. x holosericea | GB, VC55 Leicestershire, South Croxton | Arthur Reginald Horwood Olive M Horwood | Watson Botanical Exchange Club | 12/5/1906 7/1906 | MANCH |
+ | Silene gallica | GB, VC54 North Lincolnshire, Woodhall Spa,High Hall Wood | Arthur Reginald Horwood | Botanical Society & Exchange Club of The British Isles Charles Bailey | 16/9/1915 | MANCH |
| Salix viminalis x caprea = S. x smithiana | GB, VC55 Leicestershire, King's Norton | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles IRGMA Arthur Reginald Horwood | 11/7/1908 1/9/1909 | LIV |