| Glyceria fluitans x notata = G. x pedicellata | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Watson Botanical Exchange Club Charles Bailey | 28/6/1905 | 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 |
| Papaver rhoeas | GB, VC55 Leicestershire, Syston | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Augustin Ley | 6/7/1905 | BIRM |
| 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 |
| Koeleria cristata | GB, VC55 Leicestershire, Lowesby | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles | 8/7/1905 | ABS |
| Plantago major subsp. intermedia | GB, VC55 Leicestershire, Billesdon | Arthur Reginald Horwood | Watson Botanical Exchange Club Albert Bruce Jackson | 31/7/1905 | K |
| Urtica dioica | GB, VC55 Leicestershire, Quorn | Frances Louisa Foord-Kelcey | Watson Botanical Exchange Club Harold Stuart Thompson Arthur Reginald Horwood | 31/7/1905 | BIRM |
| Euphrasia nemorosa | GB, VC55 Leicestershire, South Croxton | Arthur Reginald Horwood | Alfred Loydell William Robert Sherrin | 8/1905 | SLBI |
| Pimpinella saxifraga | GB, VC55 Leicestershire, Evington | Arthur Reginald Horwood | | 5/8/1905 | BIRM |
| Salix fragilis var. britannicum | GB, VC55 Leicestershire, Quenby | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Arthur Reginald Horwood Augustin Ley | 10/5/1906 8/1906 | BIRM |
| Alchemilla vulgaris agg | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Arthur Reginald Horwood | 12/5/1906 | GLR |
| Alchemilla minor | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Arthur Reginald Horwood Augustin Ley | 12/5/1906 | BIRM |
| 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 |
| Viola hirta | GB, VC55 Leicestershire, Scraptoft | Arthur Reginald Horwood | Arthur Reginald Horwood Augustin Ley | 13/5/1906 | BIRM |
| Stellaria neglecta | GB, VC55 Leicestershire, South Croxton | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Arthur Reginald Horwood Augustin Ley | 30/5/1906 | BIRM |
| Koeleria cristata | GB, VC55 Leicestershire, Filton Hill | Arthur Reginald Horwood | Birmingham Natural History Society George Stephen West | 7/7/1906 | BIRM |
| Phleum pratense var. nodosum | GB, VC55 Leicestershire, Leicester | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Arthur Reginald Horwood | 15/7/1906 | ABS |
| 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 |
| Petroselinum segetum | GB, VC55 Leicestershire, Hungarton,Quenby | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood Augustin Ley | 6/8/1906 | BIRM |
| Koeleria cristata | GB, VC55 Leicestershire, Tilton | Arthur Reginald Horwood | Arthur Reginald Horwood Chambre Corker Vigurs | 7/8/1906 | ABS |
| Petroselinum segetum | GB, VC55 Leicestershire, Hungerton | Arthur Reginald Horwood | Arthur Reginald Horwood William Robert Sherrin | 8/8/1906 | SLBI |
| 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 caprea = S. x smithiana | GB, VC55 Leicestershire, Quenby | Arthur Reginald Horwood | Arthur Reginald Horwood Spencer Henry Bickham | 14/8/1906 4/1907 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC55 Leicestershire, Quenby | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Arthur Reginald Horwood Augustin Ley | 14/8/1906 4/1907 | BIRM |
| 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 |
| 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 |
| 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 |
| Thymus praecox subsp. arcticus | GB, VC55 Leicestershire, Billesdon | Arthur Reginald Horwood | Botanical Exchange Club of The British Isles Albert Bruce Jackson Arthur Reginald Horwood | 7/1907 | K |
| 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 |
| Tilia platyphyllos | GB, VC55 Leicestershire, South Croxton | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood Harold Stuart Thompson | 6/1908 | BIRM |
| Koeleria cristata | GB, VC55 Leicestershire, Tilton | Arthur Reginald Horwood | Watson Botanical Exchange Club Arthur Reginald Horwood Augustin Ley | 7/1908 | BIRM |
| 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 |
| Lolium multiflorum | GB, VC55 Leicestershire, Thurmaston | E E Lowe | Watson Botanical Exchange Club Arthur Reginald Horwood Augustin Ley | 5/1909 | BIRM |
| Lolium multiflorum | GB, VC55 Leicestershire, Thurmaston | Arthur Reginald Horwood E E Lowe | Watson Botanical Exchange Club Arthur Reginald Horwood Harold Stuart Thompson | 5/1909 | BIRM |
| Ulmus glabra | GB, VC55 Leicestershire, Launde | Arthur Reginald Horwood Henry Peter Reader | Botanical Exchange Club of The British Isles Arthur Reginald Horwood Augustin Ley | 7/5/1909 24/9/1909 | BIRM |
| Ulmus glabra | GB, VC55 Leicestershire, Launde | Arthur Reginald Horwood Henry Peter Reader | Botanical Exchange Club of The British Isles Arthur Reginald Horwood Augustin Ley | 7/5/1909 24/9/1909 | BIRM |
| Ulmus glabra | GB, VC55 Leicestershire, Launde | Arthur Reginald Horwood Henry Peter Reader | Botanical Exchange Club of The British Isles Arthur Reginald Horwood Augustin Ley | 7/5/1909 24/9/1909 | BIRM |
| Alchemilla vulgaris agg | GB, VC34 West Gloucestershire, Tidenham | | Arthur Reginald Horwood | 11/6/1909 | GLR |