+ | Cerastium arcticum | GB, VC92 South Aberdeenshire, Braemar,Craig-na-dal-beag | Augustin Ley | Coslett Herbert Waddell Elizabeth Anne Lomax | 14/7/1876 | MANCH |
| Cardamine impatiens | GB, VC69 Westmorland, Whitbarrow Scar IE, VCH38 Co. Down, Saintfield Cultivated | Coslett Herbert Waddell | Watson Botanical Exchange Club Allan Octavian Hume Coslett Herbert Waddell | 7/1902 | SLBI |
| Circaea lutetiana x alpina = C. x intermedia | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club Allan Octavian Hume | 7/1904 | SLBI |
| Euphrasia salisburgensis | IE, VCH8 Co. Limerick, Askeaton | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell | 7/1900 | SLBI |
| Lemna gibba | GB, VC37 Worcestershire, Ripple | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell | 8/1898 | SHYB |
| Lotus corniculatus | IE, VCH38 Co. Down, Ballykinlar | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell | 9/1900 | ABS |
| Rubus errabundus | GB, VC86 Stirlingshire, Stirling Castle | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell | 25/7/1890 | SLBI |
| Rubus nemoralis | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club Allan Octavian Hume Coslett Herbert Waddell | 4/8/1902 | SLBI |
| Scleranthus annuus | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club | 9/1903 | K |
| Thymus praecox subsp. arcticus | IE, VCH38 Co. Down, Orlock Point | Coslett Herbert Waddell | Watson Botanical Exchange Club Albert Bruce Jackson Coslett Herbert Waddell | 8/1909 | K |
| Zannichellia polycarpa | IE, VCH38 Co. Down, Belfast | Coslett Herbert Waddell | Croydon Natural History and Scientific Society Watson Botanical Exchange Club Coslett Herbert Waddell Henry Franklin Parsons | 8/1900 | SLBI |
| Zostera noltei | IE, VCH38 Co. Down, Greyabbey | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell | 7/9/1918 | SLBI |
| Potamogeton gramineus x perfoliatus = P. x nitens | IE, VCH38 Co. Down, magheralin | Coslett Herbert Waddell | Botanical Exchange Club of The British Isles Charles Bailey Coslett Herbert Waddell | 7/1904 | MANCH |
+ | Viola tricolor | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Botanical Exchange Club of The British Isles Charles Bailey Coslett Herbert Waddell | 4/10/1910 | MANCH |
| Mentha aquatica x spicata = M. x piperita | IE, VCH39 Co. Antrim, Carnmoney | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell Spencer Henry Bickham | 8/1895 | CGE |
| Eriocaulon aquaticum | IE, VCH16,VCH17, Lough Corrib | Samuel Arthur Brennan | Watson Botanical Exchange Club Coslett Herbert Waddell William Robert Sherrin | 8/1895 | SLBI |
| Pyrola media | IE, VCH36 Tyrone, Kildress | Samuel Arthur Brennan | Watson Botanical Exchange Club Coslett Herbert Waddell | 7/1897 | K |
| Pyrola media | IE, VCH36 Tyrone, Kildress | Samuel Arthur Brennan | Watson Botanical Exchange Club Coslett Herbert Waddell | 7/1897 | SLBI |
+ | Calamagrostis stricta | IE, VCH39 Co. Antrim, Lough Neagh | Coslett Herbert Waddell Nathaniel Carrothers | Watson Botanical Exchange Club Charles Bailey Coslett Herbert Waddell | 29/7/1911 | MANCH |
| Atriplex glabriuscula | IE, VCH38 Co. Down, Groomsport | Coslett Herbert Waddell | Watson Botanical Exchange Club Edward Cleminshaw | 9/1897 | BIRM |
| Viola reichenbachiana | IE, VCH39 Co. Antrim, Edenderry | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell Hugh Neville Dixon Leslie Beeching Hall | 4/4/1904 | SLBI |
| Potamogeton polygonifolius | GB, VC25 East Suffolk, Belton | George Fitt | Charles Cardale Babington Coslett Herbert Waddell | 7/1843 | MANCH |
| Mentha arvensis x aquatica x spicata = M. x smithiana | IE, VCH38 Co. Down, Bryansford Cultivated | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell | 8/1895 | LIV |
| Mentha spicata x suaveolens = M. x villosa | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | Coslett Herbert Waddell | 2/10/1894 | CGE |
| Draba muralis | IE, VCH40 Co. Londonderry, Umbra | Coslett Herbert Waddell Henry William Lett | Alfred Loydell William Robert Sherrin | 1905 | SLBI |
| Rubus lettii | IE, VCH38 Co. Down, Aghaderg Glebe | Coslett Herbert Waddell Henry William Lett | Allan Octavian Hume Coslett Herbert Waddell | 1/7/1896 | SLBI |
| Saxifraga sponhemica | IE, VCH6 Co. Waterford, Lough Coumshigaun | Coslett Herbert Waddell Henry William Lett | Allan Octavian Hume Coslett Herbert Waddell | 7/1892 | SLBI |
| Anthoxanthum aristatum subsp. puelii | GB, VC17 Surrey, Thames Ditton,Weston Green | Coslett Herbert Waddell | Botanical Exchange Club of The British Isles Augustin Ley | 9/1879 | BIRM |
| Artemisia vulgaris | GB, VC38 Warwickshire, Newbold on Stour | Coslett Herbert Waddell | Augustin Ley Coslett Herbert Waddell | 25/8/1906 | BIRM |
| Callitriche autumnalis | IE, VCH39 Co. Antrim, Lough Neagh | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 13/8/1909 | BIRM |
| Carex pulla | GB, VC88 Mid Perthshire, Ben Lawers Cultivated | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley | 6/1903 | BIRM |
| Cotula coronopifolia | GB, VC58 Cheshire, Leasowe | Monsarrat | Botanical Exchange Club of The British Isles Augustin Ley Coslett Herbert Waddell | 10/1903 | BIRM |
| Euphrasia salisburgensis | IE, VCH8 Co. Limerick, Askeaton | Coslett Herbert Waddell | Botanical Exchange Club of The British Isles Augustin Ley Coslett Herbert Waddell | 7/1908 | BIRM |
| Euphrasia salisburgensis | IE, VCH8 Co. Limerick, Ballynort nr. Askeaton | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 7/1908 | BIRM |
| Inula salicina | IE, VCH10 North Tipperary, Lough Derg | C F Lilly | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 7/1895 | BIRM |
| Mentha spicata | IE, VCH38 Co. Down, Saintfield Cultivated | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 7/1902 | BIRM |
| Polygonum aviculare | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 8/1909 | BIRM |
| Ranunculus baudotii | IE, VCH38 Co. Down, Belfast, Harbour | Coslett Herbert Waddell | Augustin Ley Coslett Herbert Waddell | 10/7/1902 | BIRM |
| Ranunculus peltatus | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 30/6/1909 | BIRM |
| Rumex maritimus | GB, VC37 Worcestershire, Droitwich | Coslett Herbert Waddell | Augustin Ley | 7/8/1907 | BIRM |