| Galium pumilum | GB, VC64 Mid-west Yorkshire, Colt Park | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 7/7/1932 | SLBI |
| Pyrola rotundifolia subsp. maritima | GB, VC59 South Lancashire, Ainsdale Dunes | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 4/8/1932 | SLBI |
| Oenanthe lachenalii | GB, VC62 North-east Yorkshire, Redcar | William Arthur Sledge | Richard Barker Ullman Patrick Martin Hall | 13/9/1932 | SLBI |
| Carex elata | GB, VC64 Mid-west Yorkshire, Askham Bog | William Arthur Sledge | Botanical Exchange Club of The British Isles William Arthur Sledge Charles Edward Britton | 7/6/1933 | SLBI |
| Hieracium vulgatum | GB, VC64 Mid-west Yorkshire, Micklefield | William Arthur Sledge | Botanical Exchange Club of The British Isles William Arthur Sledge | 24/6/1933 | SLBI |
| Allium scorodoprasum | GB, VC64 Mid-west Yorkshire, Austwick | William Arthur Sledge | Botanical Exchange Club of The British Isles Job Edward Lousley William Arthur Sledge | 8/7/1933 | SLBI |
| Utricularia ochroleuca | GB, VC69 Westmorland, Coniston Water | William Arthur Sledge | William Arthur Sledge | 2/8/1933 | SLBI |
| Hydrilla verticillata | GB, VC69 Westmorland, Esthwaite Water | William Arthur Sledge | Botanical Society & Exchange Club of The British Isles William Arthur Sledge | 3/8/1933 | SLBI |
| Hydrilla verticillata var. pomeranica | GB, VC69 Westmorland, Esthwaite Water | William Arthur Sledge | Martin F Gardner & Sabina G Knees William Arthur Sledge | 3/8/1933 | E |
| Potamogeton alpinus | GB, VC69 Westmorland, Blelham Tarn | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 5/8/1933 | SLBI |
| Circaea lutetiana x alpina = C. x intermedia | GB, VC69 Westmorland, Wray Castle | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 8/8/1933 | SLBI |
| Chenopodium | GB, VC61 South-east Yorkshire, Selby | William Arthur Sledge | William Arthur Sledge | 11/9/1933 | SLBI |
| Bassia scoparia | GB, VC61 South-east Yorkshire, Selby | J Kendall | William Arthur Sledge | 9/10/1933 | SLBI |
| Barbarea verna | GB, VC69 Westmorland, Appleby | William Arthur Sledge | Botanical Exchange Club of The British Isles Harold Stuart Thompson William Arthur Sledge | 1/6/1934 | BIRM |
| Pyrola rotundifolia | GB, VC68 North Northumberland, Newham | Patrick Martin Hall William Arthur Sledge | Botanical Exchange Club of The British Isles Patrick Martin Hall | 27/6/1934 | SLBI |
| Pyrola rotundifolia | GB, VC68 North Northumberland, Newham | Patrick Martin Hall William Arthur Sledge | Botanical Exchange Club of The British Isles Job Edward Lousley Patrick Martin Hall | 27/6/1934 | SLBI |
+ | Pyrola rotundifolia subsp. rotundifolia | GB, VC68 North Northumberland, Newham | Patrick Martin Hall William Arthur Sledge | Botanical Society & Exchange Club of The British Isles Patrick Martin Hall William Harold Pearsall | 27/6/1934 | MANCH |
| Crassula aquatica | GB, VC64 Mid-west Yorkshire, Adel Dam | William Arthur Sledge | Patrick Martin Hall Richard Barker Ullman William Arthur Sledge | 7/1934 | SLBI |
| Crassula aquatica | GB, VC64 Mid-west Yorkshire, Adel Dam | William Arthur Sledge | Botanical Exchange Club of The British Isles William Arthur Sledge | 11/7/1934 | SLBI |
| Crassula aquatica | GB, VC64 Mid-west Yorkshire, Adel Dam | William Arthur Sledge | Job Edward Lousley | 11/7/1934 | SLBI |
| Crassula aquatica | GB, VC64 Mid-west Yorkshire, Adel Dam | William Arthur Sledge | Botanical Exchange Club of The British Isles Harold Stuart Thompson William Arthur Sledge | 11/7/1934 | BIRM |
| Chenopodium chenopodioides | GB, VC11 South Hampshire, Hayling Island | Patrick Martin Hall William Arthur Sledge | Harold Stuart Thompson William Arthur Sledge | 7/9/1934 | BIRM |
| Chenopodium urbicum | GB, VC11 South Hampshire, Northney | Patrick Martin Hall William Arthur Sledge | Botanical Exchange Club of The British Isles William Arthur Sledge | 7/9/1934 | SLBI |
| Carex aquatilis | IE, VCH16 West Galway, Maam | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 9/8/1935 | SLBI |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Bealanabrack River | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 9/8/1935 | SLBI |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | William Arthur Sledge | Botanical Exchange Club of The British Isles William Arthur Sledge | 9/8/1935 | SLBI |
| Potamogeton coloratus x berchtoldii = P. x lanceolatus | IE, VCH9 Co. Clare, Caher River | William Arthur Sledge | Robert MacKechnie | 10/8/1935 | E |
| Potamogeton natans x gramineus = P. x sparganiifolius | IE, VCH16 West Galway, Maam | William Arthur Sledge | Botanical Exchange Club of The British Isles William Arthur Sledge | 9/9/1935 | MANCH |
| Helleborus foetidus | GB, VC62 North-east Yorkshire, Oldstead | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 22/3/1936 | SLBI |
| Helleborus viridis | GB, VC64 Mid-west Yorkshire, Collingham | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 2/4/1936 | SLBI |
| Viola odorata x hirta = V. x scabra | GB, VC64 Mid-west Yorkshire, Boston Spa | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 23/4/1936 | SLBI |
| Carex appropinquata | GB, VC64 Mid-west Yorkshire, Askham Bog | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 21/6/1936 | SLBI |
| Carex elongata | GB, VC64 Mid-west Yorkshire, Askham Bog | William Arthur Sledge | Botanical Exchange Club of The British Isles | 21/6/1936 | SLBI |
| Carex elongata | GB, VC64 Mid-west Yorkshire, Askham Bog | William Arthur Sledge | Job Edward Lousley William Arthur Sledge | 21/6/1936 | SLBI |
| Carex divulsa subsp. leersii | GB, VC62 North-east Yorkshire, Hovingham | William Arthur Sledge | Patrick Martin Hall William Arthur Sledge | 24/6/1936 | BM |
| Vaccinium vitis-idaea x myrtillus = V. x intermedium | GB, VC57 Derbyshire, Ringinglow | William Arthur Sledge | Botanical Exchange Club of The British Isles William Arthur Sledge | 27/6/1936 | SLBI |
| Vaccinium vitis-idaea x myrtillus = V. x intermedium | GB, VC57 Derbyshire, Ringinglow | William Arthur Sledge | William Arthur Sledge | 27/6/1936 | SLBI |
| Lysimachia thyrsiflora | GB, VC62 North-east Yorkshire, Thirsk, Carlton Carr | William Arthur Sledge | William Arthur Sledge | 28/6/1936 | SLBI |
| Allium roseum | GB, VC65 North-west Yorkshire, Camp Hill | William Arthur Sledge | William Arthur Sledge | 16/4/1937 | SLBI |
| Vicia lathyroides | GB, VC61 South-east Yorkshire, Kilnsea | William Arthur Sledge | William Arthur Sledge | 13/6/1933 30/5/1937 | SLBI |