| Mentha arvensis x aquatica = M. x verticillata | GB, VC52 Anglesey, Benllech | M Hildred Bigwood | | 9/1952 | LIV |
+ | Impatiens glandulifera | GB, VC39 Staffordshire, Wombourne, South Staffordshire | M Hildred Bigwood | | 7/1953 | LIV |
+ | Linnaea borealis | GB, VC95 Moray, Grantown on Spey | M Hildred Bigwood | | 1/7/1953 | LIV |
| Mentha aquatica x spicata = M. x piperita | GB, VC50 Denbighshire, Llangollen | M Hildred Bigwood | M Hildred Bigwood | 28/7/1954 | LIV |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC50 Denbighshire, Llangollen | M Hildred Bigwood | M Hildred Bigwood | 28/7/1954 | LIV |
| Mentha aquatica x spicata = M. x piperita | GB, VC50 Denbighshire, Llangollen | M Hildred Bigwood | | 4/9/1955 | LIV |
| Mentha aquatica x spicata = M. x piperita | GB, VC50 Denbighshire, Llangollen | M Hildred Bigwood | | 4/9/1955 | LIV |
| Carex maritima | GB, VC108 West Sutherland, Bettyhill | M Hildred Bigwood | | 7/1956 | ABS |
| Salix aurita x repens = S. x ambigua | GB, VC49 Caernarvonshire, Great Orme | M Hildred Bigwood | M Hildred Bigwood | 4/1958 | LIV |
| Carex montana | GB, VC37 Worcestershire, Bewdley | M Hildred Bigwood | | 7/1963 | ABS |
| Fagopyrum esculentum | GB, VC47 Montgomeryshire, Dolanog | M Hildred Bigwood | | 7/1964 | ABS |
| Carex atrata | GB, Perthshire | M Hildred Bigwood | | 6/1965 | ABS |
| Carex pulicaris | GB, VC108 West Sutherland, Altnaharra | M Hildred Bigwood | | 6/1965 | ABS |
| Carex dioica | GB, VC88 Mid Perthshire, Ben Lawers | M Hildred Bigwood | Flora Hibernica | 12/6/1965 | ABS |
| Carex pilulifera | GB, VC88 Mid Perthshire, Ben Lawers | M Hildred Bigwood | | 12/6/1965 | ABS |
| Carex viridula subsp. brachyrrhyncha | GB, VC88 Mid Perthshire, Ben Lawers | M Hildred Bigwood | | 12/6/1965 | ABS |
| Carex pulla | GB, VC88 Mid Perthshire, Mt opposite Ben Lawers | M Hildred Bigwood | | 13/6/1965 | ABS |
| Carex viridula subsp. brachyrrhyncha | GB, VC88 Mid Perthshire, Ben Lawers | M Hildred Bigwood | | 13/6/1965 | ABS |
| Carex pulicaris | GB, VC95,VC96, Nethy Bridge | M Hildred Bigwood | | 17/6/1965 | ABS |
| Carex viridula subsp. brachyrrhyncha | GB, VC108 West Sutherland, Inchnadamph | M Hildred Bigwood | | 23/6/1965 | ABS |
| Carex viridula subsp. brachyrrhyncha | GB, VC105 West Ross & Cromarty, Enard Bay | M Hildred Bigwood | | 24/6/1965 | ABS |
| Thalictrum flavum | IE, VCH11 Co. Kilkenny, Templemore | M Hildred Bigwood | | 11/7/1965 | ABS |
| Vicia orobus | GB, VC44,VC46, Llanybyther | M Hildred Bigwood | | 6/1966 | ABS |
| Juncus acutus | GB, VC48 Merionethshire, Mochras | M Hildred Bigwood | | 7/1966 | ABS |
| Ammi majus | GB, VC39 Staffordshire, Wolverhampton | C Jones M Hildred Bigwood | | 8/1966 | ABS |
| Sisyrinchium bermudiana | GB, VC46 Cardiganshire | M Hildred Bigwood | | 8/1966 | ABS |
| Linaria vulgaris x repens = L. x sepium | GB, VC46 Cardiganshire, Capel Bangor | M Hildred Bigwood | | 9/1966 | ABS |
| Serratula tinctoria | GB, VC46 Cardiganshire, Llanfihangel-y-creuddyn | M Hildred Bigwood | | 9/1966 | ABS |
| Cardamine hirsuta | GB, VC46 Cardiganshire, Llanfihangel-y-creuddyn | M Hildred Bigwood | | 1/1967 | ABS |
| Cochlearia danica | GB, VC46 Cardiganshire, Aberystwyth | M Hildred Bigwood | | 4/1967 | ABS |
| Cochlearia officinalis | GB, VC46 Cardiganshire, Tanybwlch | M Hildred Bigwood | | 4/1967 | ABS |
| Catapodium marinum | GB, VC41 Glamorganshire, Swansea,Llangennith Burrows | M Hildred Bigwood | | 5/1967 | ABS |
| Sorbus rupicola | GB, VC7 North Wiltshire, Calne | M Hildred Bigwood | | 5/1967 | ABS |
| Cochlearia danica | GB, VC46 Cardiganshire, Aberystwyth | M Hildred Bigwood | | 6/1967 | ABS |
| Cochlearia officinalis | GB, VC46 Cardiganshire, Tanybwlch | M Hildred Bigwood | | 6/1967 | ABS |
| Trifolium scabrum | GB, VC41 Glamorganshire, Pennard | M Hildred Bigwood | | 2/6/1967 | ABS |
| Crepis nicaeensis | GB, VC46 Cardiganshire, Llanfihangel-y-creuddyn | M Hildred Bigwood | | 7/1967 | ABS |
| Apium nodiflorum | GB, VC45 Pembrokeshire, Goodwick | M Hildred Bigwood | | 1/8/1967 | ABS |
| Centaurium scilloides | GB, VC45 Pembrokeshire, Newport | M Hildred Bigwood | | 1/8/1967 | ABS |
| Cicendia filiformis | GB, VC45 Pembrokeshire, Goodwick | M Hildred Bigwood | | 1/8/1967 | ABS |