| Salix daphnoides | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Botanical Exchange Club of The British Isles Augustin Ley Coslett Herbert Waddell | 4/1909 to 8/1909 | BIRM |
| Viola tricolor subsp. curtisii | IE, VCH38 Co. Down, Dundrum | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 26/4/1902 | BIRM |
| Viola tricolor subsp. saxatilis | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 4/10/1910 | BIRM |
| Pilosella peleteriana | IE, VCH39 Co. Antrim, Core Hill, Belfast Cultivated | Coslett Herbert Waddell | Botanical Exchange Club of The British Isles Coslett Herbert Waddell Edward Francis Linton Samuel Alexander Stewart | 8/1900 | ABS |
+ | Euphorbia hyberna | IE, VCH2 North Kerry, Killarney,Cromagloun (Cromaglan) | Samuel Alexander Stewart | Coslett Herbert Waddell Elizabeth Anne Lomax | 18/6/1885 | MANCH |
+ | Helianthemum oelandicum subsp. levigatum | GB, VC65 North-west Yorkshire, Middleton in Teesdale,Cronkley Fell | Henry Elliott Fox | Botanical Exchange Club of The British Isles Coslett Herbert Waddell Elizabeth Anne Lomax | 2/7/1886 | MANCH |
+ | Muscari neglectum | GB, VC15 East Kent, Luddenham | Frederic Henry Ward | Coslett Herbert Waddell Elizabeth Anne Lomax | 18/5/1887 | MANCH |
| Spergularia rupicola | IE, VCH38 Co. Down, Portaferry | Coslett Herbert Waddell | Alfred Loydell William Robert Sherrin | 9/1905 | SLBI |
| Arenaria serpyllifolia | IE, VCH31 Co. Louth, Omeath | Coslett Herbert Waddell | Watson Botanical Exchange Club Charles Edgar Salmon Edward Shearburn Marshall Harold Stuart Thompson | 7/1916 | BIRM |
| Polygonum aviculare | IE, VCH38 Co. Down, Ballywalter | Coslett Herbert Waddell | Watson Botanical Exchange Club Arthur Bennett Charles Edgar Salmon Coslett Herbert Waddell Edward Shearburn Marshall Harold Stuart Thompson | 21/9/1917 | BIRM |
| Crepis capillaris | IE, VCH19 Co. Kildare, Grey Abbey | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell William Robert Sherrin | 5/7/1913 | SLBI |
| Rubus fissus | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Allan Octavian Hume Coslett Herbert Waddell | 6/7/1905 | SLBI |
| Rubus fissus | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Allan Octavian Hume Coslett Herbert Waddell | 6/7/1905 | SLBI |
| Cotula coronopifolia | GB, VC58 Cheshire, Leasowe | Monsarrat | Coslett Herbert Waddell William Hunt Painter | 10/1903 | ABS |
| Mentha suaveolens x longifolia = M. x rotundifolia | IE, VCH38 Co. Down, Saul Cultivated | Coslett Herbert Waddell | Coslett Herbert Waddell William Hunt Painter | 9/1894 | ABS |
| Puccinellia maritima | IE, VCH38 Co. Down, Strangford Lough | Coslett Herbert Waddell | Botanical Exchange Club of The British Isles Coslett Herbert Waddell William Hunt Painter | 7/1904 | ABS |
| Solidago virgaurea var. angustifolia | IE, VCH38 Co. Down, Tollymore Park | Coslett Herbert Waddell | Coslett Herbert Waddell William Hunt Painter | 9/1895 | ABS |
| Barbarea intermedia | IE, VCH38 Co. Down, Greyabbey | Coslett Herbert Waddell | Botanical Exchange Club of The British Isles Coslett Herbert Waddell Douglas Montague Heath Frederick Robinson | 6/1917 | BIRM |
| Bromus racemosus | IE, VCH38 Co. Down, Rathfriland | Coslett Herbert Waddell | Watson Botanical Exchange Club Charles Edgar Salmon | 14/7/1900 | ABS |
| Rubus mucronulatus | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club Charles Edgar Salmon Coslett Herbert Waddell | 9/8/1894 | ABS |
| Rubus procerus | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club Charles Edgar Salmon Coslett Herbert Waddell | 31/8/1897 | ABS |
| Rubus rogersii | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Coslett Herbert Waddell Charles Edgar Salmon | 27/8/1894 1/9/1894 | SHYB |
| Callitriche hermaphroditica | VCH39, Harbour Island | Coslett Herbert Waddell | Watson Botanical Exchange Club William Robert Sherrin | 18/8/1909 | SLBI |
| Fallopia convolvulus var. subalatum | IE, VCH38 Co. Down, grey abbey | Coslett Herbert Waddell | Watson Botanical Exchange Club William Robert Sherrin | 9/1914 | SLBI |
| Galium album | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | William Robert Sherrin | 5/1896 | SLBI |
| Lathyrus palustris | IE, VCH37 Co. Armagh, Lough Neagh | S A Blenan | Watson Botanical Exchange Club Coslett Herbert Waddell William Robert Sherrin | 5/7/1865 | SLBI |
| Polygonum arenastrum | IE, VCH38 Co. Down, grey abbey | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell William Robert Sherrin | 9/1916 | SLBI |
| Polygonum aviculare var. littorale | IE, VCH38 Co. Down, Ballywalter | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell William Robert Sherrin | 21/9/1917 | SLBI |
| Rosa canina x obtusifolia = R. x dumetorum | IE, VCH38 Co. Down, grey abbey | Coslett Herbert Waddell | Watson Botanical Exchange Club William Robert Sherrin | 31/8/1915 | SLBI |
| Allium oleraceum | GB, VC63 South-west Yorkshire, Sprotbrough | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | 7/1901 | BIRM |
| Apium inundatum | IE, VCH38 Co. Down, Kircubbin | Coslett Herbert Waddell | Watson Botanical Exchange Club Harold Stuart Thompson | 1918 | BIRM |
| Apium inundatum | IE, VCH38 Co. Down, Kircubbin | Coslett Herbert Waddell | Watson Botanical Exchange Club Harold Stuart Thompson | 1918 | BIRM |
| Atriplex patula | IE, VCH38 Co. Down, Killough | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | 8/1897 | BIRM |
| Brassica rapa var. briggsii | IE, VCH37,VCH38, Warrenpoint | Coslett Herbert Waddell | Watson Botanical Exchange Club Harold Stuart Thompson | 7/1916 | BIRM |
| Callitriche hamulata | IE, VCH38 Co. Down, Castlewellan Forest Park | Samuel Alexander Stewart | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | 7/6/1897 | BIRM |
| Carex ornithopoda | GB, VC69 Westmorland, Scout Scar | Coslett Herbert Waddell | Coslett Herbert Waddell Harold Stuart Thompson | 7/1895 | BIRM |
| Ceterach officinarum | IE, VCH38 Co. Down, Crossgar | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | 5/9/1900 | BIRM |
| Circaea lutetiana x alpina = C. x intermedia | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | | BIRM |
| Eleogiton fluitans | IE, VCH38 Co. Down, Kircubbin | Coslett Herbert Waddell | Coslett Herbert Waddell Harold Stuart Thompson Watson Botanical Exchange Club | 7/1918 | BIRM |
| Equisetum pratense | IE, VCH39 Co. Antrim, Belfast | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | 5/1901 | BIRM |