| Mentha arvensis x spicata = M. x gracilis | GB, VC23 Oxfordshire, Oxford | J Gray | John Durbin Gray | 1830 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC38 Warwickshire, Haseley | Henry Bromwich | John Durbin Gray Botanical Exchange Club of The British Isles | 8/1881 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC23 Oxfordshire, Oxford | J Gray | J Gray John Durbin Gray | 1830 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC38 Warwickshire, Warwick | John Fraser | John Durbin Gray | 8/1878 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC36 Herefordshire, Kerne Bridge | Edward Francis Linton | John Durbin Gray | 20/8/1894 | CGE |
| Mentha spicata x longifolia = M. x villosonervata | GB, VC36 Herefordshire, Whitney | Margaret Dawber | John Durbin Gray | 29/8/1890 | CGE |
| Mentha spicata x suaveolens = M. x villosa | GB, VC57 Derbyshire, Matlock | A Steuart Eleonora Armitage Harry Corbyn Levinge | Harry Corbyn Levinge John Durbin Gray | 30/8/1893 | CGE |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC23 Oxfordshire, Oxford, Botanic Gardens Cultivated | J Gray | John Durbin Gray | 1829 | CGE |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC27 East Norfolk, Reedham | Edward Francis Linton | John Durbin Gray | 9/1889 | CGE |
| Oenothera stricta | GB, VC5 South Somerset, Minehead Warren | Harold Stuart Thompson John Durbin Gray Leslie Beeching Hall | Harold Stuart Thompson | 7/1922 | BIRM |
| Oxalis stricta | GB, VC26 West Suffolk, Nayland | John Durbin Gray | Harold Stuart Thompson | 8/1893 | BIRM |
| Pentaglottis sempervirens | GB, VC26 West Suffolk, Nayland | John Durbin Gray | | 6/1893 | SHYB |
| Pentaglottis sempervirens | GB, VC26 West Suffolk, Nayland | John Durbin Gray | S A Chambers | 6/1893 | SLBI |
+ | Petrorhagia nanteuilii | GB, VC113 Channel Islands, Jersey, Quennevais | John Durbin Gray | Willis Openshaw Howarth | 7/1894 | MANCH |
| Potamogeton alpinus | GB, VC40 Shropshire, Ellesmere | John Durbin Gray | | 7/1893 | SLBI |
| Rosa obtusifolia | GB, VC26 West Suffolk, Nayland | John Durbin Gray | | 6/1898 | ABS |
| Rosa obtusifolia subsp. tomentella | GB, VC26 West Suffolk, Wiston | John Durbin Gray | Allan Octavian Hume | 6/1892 | SLBI |
| Rubus armeniacus | GB, VC19 North Essex, Great Horkesley | John Durbin Gray | | 1/9/1890 | SLBI |
| Rubus armeniacus | GB, VC19 North Essex, Great Horkesley | John Durbin Gray | | 1/9/1890 | SLBI |
| Rubus chloocladus | GB, VC19 North Essex, Great Horkesley | John Durbin Gray | | 1/9/1890 | ABS |
| Rubus dasyphyllus | GB, VC26 West Suffolk, Polstead | John Durbin Gray | Richard Spiers Standen | 9/8/1898 | SLBI |
| Rubus gratus | GB, VC27 East Norfolk, Sprowston | John Durbin Gray | | 6/1887 | ABS |
| Rubus lintonii | GB, VC27 East Norfolk, Sprowston | John Durbin Gray | Edward Francis Linton | 7/1887 | ABS |
| Salix aurita x repens = S. x ambigua | GB, VC9 Dorset, Littlesea | Edward Francis Linton John Durbin Gray | John Durbin Gray | 7/1890 | CGE |
| Salix aurita x repens = S. x ambigua | GB, VC19 North Essex, Audley End | James Marmaduke Hick | John Durbin Gray | 1883 | CGE |
| Salix fragilis x alba = S. x rubens | GB, VC26 West Suffolk, Tuddenham | John Durbin Gray | | 5/1884 | CGE |
| Salix fragilis x alba = S. x rubens | Cultivated | James Marmaduke Hick | John Durbin Gray | 1883 | CGE |
| Salix fragilis x alba = S. x rubens | GB, VC30 Bedfordshire, Purvey | Edward Francis Linton | John Durbin Gray | 17/4/1894 | CGE |
| Salix fragilis x alba = S. x rubens | GB, VC37 Worcestershire, Malvern Link | Richard Francis Towndrow | John Durbin Gray | 6/1888 8/1888 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC38 Warwickshire, Kenilworth Chase | Henry Bromwich | John Durbin Gray | 4/1881 to 9/1881 | CGE |
| Seriphidium maritimum | GB, VC19 North Essex, Thorrington | James Chapman Shenstone | William Hunt Painter John Durbin Gray | 9/1886 | ABS |
| Seriphidium maritimum | GB, VC19 North Essex, Thorrington | John Durbin Gray | Harold Stuart Thompson | 9/1887 | BIRM |
| Sibthorpia europaea | GB, VC113 Channel Islands, Jersey, Saint Ouen's | John Durbin Gray | | 7/1894 | K |
| Silene noctiflora | GB, VC26 West Suffolk, Culford Heath | John Durbin Gray | Harold Stuart Thompson | 5/1879 | BIRM |
| Trinia glauca | GB, VC34 West Gloucestershire, Saint Vincent's Rocks | John Durbin Gray | Watson Botanical Exchange Club Augustin Ley Richard Spiers Standen | 7/1889 | BIRM |
| Veronica spicata | GB, VC26 West Suffolk, Culford Heath | John Durbin Gray | William Hunt Painter | 7/1879 | ABS |
| Veronica spicata | GB, VC26 West Suffolk, Wordwell | John Durbin Gray | | 8/1878 | K |
| Zannichellia palustris | GB, VC19 North Essex, Frinton | John Durbin Gray | | 9/1889 | ABS |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC63 South-west Yorkshire, Pollington | Phineas Fox Lee | John Durbin Gray Watson Botanical Exchange Club | 1884 | CGE |