| Potamogeton gramineus x perfoliatus = P. x nitens | GB, VC69 Westmorland, Eamont Bridge | Catherine Muriel Rob | | 18/9/1949 | MANCH |
| Mentha arvensis x spicata = M. x gracilis | GB, VC64 Mid-west Yorkshire, Nunwick | Catherine Muriel Rob | Botanical Society & Exchange Club of The British Isles Catherine Muriel Rob | 11/9/1947 | K |
| Mentha arvensis x spicata = M. x gracilis | GB, VC64 Mid-west Yorkshire, Nunwick | Catherine Muriel Rob | Botanical Society of The British Isles Druce Herbarium, Oxford Catherine Muriel Rob | 11/9/1947 | OXF |
+ | Mentha arvensis x spicata = M. x gracilis | GB, VC64 Mid-west Yorkshire, Ripon (near),River Ure | Catherine Muriel Rob | Botanical Society of The British Isles Sledge | 11/9/1947 | MANCH |
+ | Mentha arvensis x spicata = M. x gracilis | GB, VC64 Mid-west Yorkshire, Ripon (near),River Ure | Catherine Muriel Rob | Botanical Society of The British Isles Sledge | 11/9/1947 | MANCH |
| Mentha arvensis | GB, VC64 Mid-west Yorkshire, Cawood | Catherine Muriel Rob | Catherine Muriel Rob | 28/7/1947 | K |
| Rubus pallidus | GB, VC62 North-east Yorkshire, Pilmoor | Catherine Muriel Rob | William Charles Richard Watson | 21/7/1947 | SLBI |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC65 North-west Yorkshire, Tanfield | Catherine Muriel Rob | Botanical Society of The British Isles Catherine Muriel Rob | 20/7/1947 | MANCH |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC64,VC65, Tanfield | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Catherine Muriel Rob | 20/7/1947 | K |
| Agrimonia procera | GB, VC62 North-east Yorkshire, Pilmoor | Catherine Muriel Rob | | 12/7/1947 | SLBI |
| Potamogeton pectinatus | GB, VC62 North-east Yorkshire, Thirsk | Catherine Muriel Rob | Catherine Muriel Rob | 13/8/1946 | MANCH |
| Euphrasia nemorosa | GB, VC62 North-east Yorkshire, Knayton | Catherine Muriel Rob | Catherine Muriel Rob | 2/8/1946 | SLBI |
| Euphrasia nemorosa | GB, VC62 North-east Yorkshire, Knayton | Catherine Muriel Rob | Botanical Society & Exchange Club of The British Isles Catherine Muriel Rob Eric Lister Swann | 2/8/1946 | BR |
| Potamogeton berchtoldii | GB, VC62 North-east Yorkshire, Kirby Knowle | Catherine Muriel Rob | Catherine Muriel Rob | 2/8/1946 | MANCH |
| Veronica filiformis | GB, VC62 North-east Yorkshire, Catton | Catherine Muriel Rob | Botanical Society & Exchange Club of The British Isles Catherine Muriel Rob | 4/5/1946 | K |
+ | Mentha aquatica x spicata = M. x piperita | GB, VC66 County Durham, Teesdale | Catherine Muriel Rob | Catherine Muriel Rob | 14/4/1946 | MANCH |
| Salix purpurea | GB, VC62 North-east Yorkshire, Catton | Catherine Muriel Rob | Botanical Society & Exchange Club of The British Isles Catherine Muriel Rob | 6/4/1946 30/6/1946 | SLBI |
| Carex divulsa | GB, VC65 North-west Yorkshire, Coverham | Catherine Muriel Rob | Botanical Society & Exchange Club of The British Isles Catherine Muriel Rob | 4/7/1945 | BM |
| Carex divulsa subsp. leersii | GB, VC65 North-west Yorkshire, Coverham | Catherine Muriel Rob | Botanical Society & Exchange Club of The British Isles Catherine Muriel Rob | 4/7/1945 | BM |
| Carex muricata subsp. pairae | GB, VC65 North-west Yorkshire, Coverham | Catherine Muriel Rob | Botanical Society & Exchange Club of The British Isles Catherine Muriel Rob | 4/7/1945 | SLBI |
| Carex muricata subsp. pairae | GB, VC62 North-east Yorkshire, Catton | Catherine Muriel Rob | Botanical Society & Exchange Club of The British Isles Catherine Muriel Rob | 1/7/1945 | SLBI |
| Carex muricata subsp. pairae | GB, VC62 North-east Yorkshire, Catton | Catherine Muriel Rob | Botanical Society & Exchange Club of The British Isles Catherine Muriel Rob | 1/7/1945 | BM |
| Carex muricata subsp. pairae | GB, VC62 North-east Yorkshire, Catton | Catherine Muriel Rob | Catherine Muriel Rob | 1/7/1945 | SLBI |
| Alnus incana | GB, VC62 North-east Yorkshire, Kepwick | Catherine Muriel Rob | Catherine Muriel Rob | 13/7/1939 | SLBI |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC66 County Durham, Wynch Bridge | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Catherine Muriel Rob | 3/9/1938 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC66 County Durham, Wynch Bridge | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Catherine Muriel Rob | 3/9/1938 | SLBI |
| Mentha arvensis x spicata = M. x gracilis | GB, VC66 County Durham, Wynch Bridge | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Catherine Muriel Rob | 3/9/1938 | SLBI |
| Plantago lanceolata | GB, VC62 North-east Yorkshire, Carlton in Cleveland | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Flora of North East Yorkshire Catherine Muriel Rob | 7/8/1938 | K |
| Plantago lanceolata | GB, VC62 North-east Yorkshire, Sudfield Catton | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Catherine Muriel Rob | 7/8/1938 | SLBI |
| Mentha longifolia | GB, VC17 Surrey, Bullswater Common | Catherine Muriel Rob Joanna Charlotte Davy | Botanical Exchange Club of The British Isles Catherine Muriel Rob | 28/7/1938 | SLBI |
| Crepis biennis | GB, VC62 North-east Yorkshire, Topcliffe | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Catherine Muriel Rob | 22/6/1938 | SLBI |
| Crepis biennis | GB, North Yorkshire, Topcliffe | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Job Edward Lousley | 22/6/1938 | SLBI |
| Sorbus intermedia | GB, VC62 North-east Yorkshire, Sun beck Junction | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Catherine Muriel Rob Job Edward Lousley | 17/6/1938 | SLBI |
| Carex elata | GB, VC62 North-east Yorkshire, Pilmoor | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Catherine Muriel Rob Job Edward Lousley | 17/5/1938 | SLBI |
| Taraxacum lacistophyllum | GB, VC65 North-west Yorkshire, Bedale | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Catherine Muriel Rob | 15/5/1938 | SLBI |
| Viola ruralis | GB, VC62 North-east Yorkshire, Catton | Catherine Muriel Rob | Patrick Martin Hall | 9/5/1938 | SLBI |
+ | Lycopodiella inundata | GB, VC11 South Hampshire, Lyndhurst,??Skymers Minor | D | Catherine Muriel Rob | 18/8/1937 | MANCH |
| Carex disticha | GB, VC62 North-east Yorkshire, Terrington Carr | Catherine Muriel Rob | Botanical Society & Exchange Club of The British Isles Catherine Muriel Rob | 29/7/1937 | BM |
| Rubus nemoralis | GB, VC62 North-east Yorkshire, Yearsley Moor | Catherine Muriel Rob | Botanical Exchange Club of The British Isles Catherine Muriel Rob | 29/7/1937 | SLBI |
| Potamogeton alpinus | GB, VC62 North-east Yorkshire, Castle Howard | Catherine Muriel Rob | Botanical Society & Exchange Club of The British Isles Catherine Muriel Rob | 21/7/1937 | SLBI |