+ | Cotoneaster cambricus | GB, VC49 Caernarvonshire, Llandudno,Great Orme | John Edwards Griffith | Charles Bailey | 4/1879 | MANCH |
+ | Tephroseris integrifolia subsp. maritima | GB, VC52 Anglesey, South Stack | John Edwards Griffith | Charles Bailey | 6/1884 | MANCH |
+ | Asplenium trichomanes x septentrionale = A. x alternifolium | GB, VC48 Merionethshire, Dolgellau | John Edwards Griffith | Botanical Exchange Club Charles Bailey | 7/1879 | MANCH |
| Asplenium septentrionale | GB, VC49 Caernarvonshire, Llanrwst | John Edwards Griffith | Watson Botanical Exchange Club Albert John Crosfield | 8/1917 | BIRM |
| Centaurium erythraea | GB, VC52 Anglesey, Maelog Sands | John Edwards Griffith | Watson Botanical Exchange Club | | SLBI |
| Dactylorhiza incarnata | GB, VC52 Anglesey, Cors Bodeilio | John Edwards Griffith | Watson Botanical Exchange Club | 5/1918 | SLBI |
| Galeopsis segetum | GB, VC49 Caernarvonshire, Bangor | John Edwards Griffith | Watson Botanical Exchange Club Allan Octavian Hume | 8/1900 | SLBI |
| Galeopsis segetum | GB, VC49 Caernarvonshire, Bangor | John Edwards Griffith | Watson Botanical Exchange Club Allan Octavian Hume | 9/1900 | SLBI |
| Galeopsis segetum | GB, VC49 Caernarvonshire, Bangor | John Edwards Griffith | Watson Botanical Exchange Club Lester Vallis Lester-Garland | 1900 30/8/1901 | K |
| Potamogeton coloratus x berchtoldii = P. x lanceolatus | GB, VC52 Anglesey, Lligwy | John Edwards Griffith | Watson Botanical Exchange Club | 8/1919 | MANCH |
| Rubus chrysoxylon | GB, VC49 Caernarvonshire, Bangor | John Edwards Griffith | Watson Botanical Exchange Club Allan Octavian Hume William Moyle Rogers | 21/8/1905 | SLBI |
| Rubus griffithianus | GB, VC49 Caernarvonshire, Bangor | John Edwards Griffith | Watson Botanical Exchange Club Allan Octavian Hume William Moyle Rogers | 23/8/1905 | SLBI |
| Rubus mollissimus | GB, VC49 Caernarvonshire, Bangor, Siliwen Woods | John Edwards Griffith | Watson Botanical Exchange Club | 7/1897 | SLBI |
| Rubus semiglaber | GB, VC49 Caernarvonshire, Bangor | John Edwards Griffith | Watson Botanical Exchange Club | 7/1917 | SLBI |
| Tephroseris integrifolia | GB, VC52 Anglesey, South Stack | John Edwards Griffith | Watson Botanical Exchange Club | 9/6/1905 | K |
| Achillea ptarmica | GB, VC49 Caernarvonshire, Llanberis | Charles Bailey John Edwards Griffith | Charles Bailey | 15/9/1888 | MANCH |
+ | Baldellia ranunculoides | GB, VC52 Anglesey, Llyn Maelog | John Edwards Griffith | Botanical Exchange Club of The British Isles Charles Bailey | 6/1889 | MANCH |
+ | Cotoneaster cambricus | GB, VC49 Caernarvonshire, Great Orme's Head | John Edwards Griffith | Charles Bailey John Edwards Griffith | 4/1887 | MANCH |
+ | Cotoneaster cambricus | GB, VC49 Caernarvonshire, Great Orme's Head | John Edwards Griffith | Botanical Exchange Club of The British Isles Charles Bailey | 4/1886 | MANCH |
| Dianthus plumarius | GB, VC49 Caernarvonshire, Conway | John Edwards Griffith | Charles Bailey | 7/1887 | BIRM |
+ | Eleocharis parvula | GB, VC49 Caernarvonshire, Bangor | John Edwards Griffith | Charles Bailey | 9/1891 | MANCH |
| Equisetum variegatum | GB, VC52 Anglesey, Aberffraw | John Edwards Griffith | Botanical Exchange Club of The British Isles Charles Bailey | 8/1883 | BIRM |
+ | Euphrasia tetraquetra | GB, VC52 Anglesey, Cemlyn Bay | John Edwards Griffith | Charles Bailey | | MANCH |
| Isoetes lacustris | GB, VC49 Caernarvonshire, Pwllheli | John Edwards Griffith | Botanical Exchange Club of The British Isles Charles Bailey | 7/1896 | BIRM |
| Juncus articulatus x acutiflorus = J. x surrejanus | GB, VC52 Anglesey, Llyn Coron | Augustin Ley John Edwards Griffith | Botanical Exchange Club of The British Isles Charles Bailey | 22/8/1894 | MANCH |
+ | Lavatera cretica | GB, VC113 Channel Islands, Ruette Braye Cultivated | John Edwards Griffith | Botanical Exchange Club of The British Isles Charles Bailey | 12/8/1888 | MANCH |
+ | Lavatera cretica | GB, VC113 Channel Islands, Ruette Braye Cultivated | John Edwards Griffith | Botanical Exchange Club of The British Isles Charles Bailey | 12/8/1888 | MANCH |
+ | Lonicera xylosteum | GB, VC52 Anglesey | John Edwards Griffith | Charles Bailey | 9/1885 | MANCH |
+ | Lonicera xylosteum | nr Bangor | John Edwards Griffith | Charles Bailey | 9/1885 | MANCH |
+ | Mentha aquatica x spicata = M. x piperita | GB, VC52 Anglesey | John Edwards Griffith | Charles Bailey | 10/1891 | MANCH |
| Potamogeton alpinus x praelongus = P. x griffithii | GB, VC49 Caernarvonshire, Llyn Anafon | John Edwards Griffith | Charles Bailey Arthur Bennett | 8/1882 | MANCH |
| Potamogeton alpinus x praelongus = P. x griffithii | GB, VC49 Caernarvonshire, Llyn Anafon | John Edwards Griffith | Botanical Exchange Club of The British Isles Charles Bailey | 6/1887 | MANCH |
| Potamogeton alpinus x praelongus = P. x griffithii | GB, VC49 Caernarvonshire, Llyn Anafon | John Edwards Griffith | Charles Bailey John Edwards Griffith | 7/1882 | MANCH |
| Potamogeton gramineus | GB, VC52 Anglesey, Dinan Lake | John Edwards Griffith | Botanical Exchange Club of The British Isles Arthur Bennett Charles Bailey | 8/1893 | MANCH |
| Potamogeton lucens | GB, VC52 Anglesey, Anglesey | John Edwards Griffith | Botanical Exchange Club of The British Isles Charles Bailey | 8/1893 | MANCH |
| Potamogeton lucens x gramineus = P. x angustifolius | GB, VC52 Anglesey | John Edwards Griffith | Botanical Exchange Club of The British Isles | 6/1884 | MANCH |
| Potamogeton pectinatus | GB, VC52 Anglesey, River Cefni | John Edwards Griffith | Botanical Exchange Club of The British Isles Charles Bailey | 8/1890 | MANCH |
+ | Saxifraga hypnoides | GB, VC49 Caernarvonshire, Cwm Idwal | John Edwards Griffith | Charles Bailey | 9/6/1846 | MANCH |
| Tanacetum corymbosum | GB, VC49 Caernarvonshire, Bangor | John Edwards Griffith | | 2/8/1887 | BSBI |
+ | Tephroseris integrifolia subsp. maritima | GB, VC52 Anglesey, Holyhead | John Edwards Griffith | Charles Bailey | 6/1885 | MANCH |