| Rubus nemoralis | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club Allan Octavian Hume Coslett Herbert Waddell | 4/8/1902 | SLBI |
| 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 |
| Rubus rufescens | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | | 4/8/1902 | SLBI |
| 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 |
| Scleranthus annuus | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Watson Botanical Exchange Club | 9/1903 | K |
| Senecio sarracenicus | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Allan Octavian Hume Coslett Herbert Waddell | 16/7/1905 | SLBI |
| Senecio sarracenicus | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Allan Octavian Hume | 16/7/1905 | SLBI |
| Senecio sarracenicus | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Allan Octavian Hume | 16/7/1905 | SLBI |
| Valeriana officinalis | IE, VCH38 Co. Down, Saintfield | Coslett Herbert Waddell | Coslett Herbert Waddell Harold Stuart Thompson | 8/1895 | BIRM |
+ | 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 |
| 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 |
| Rubus lettii | IE, VCH38 Co. Down, Saintfield Vicarage | Coslett Herbert Waddell | Coslett Herbert Waddell William Moyle Rogers | 12/8/1898 | SLBI |
| Hieracium sect. Hieracium | IE, VCH38 Co. Down, Saintfield, Rowallane | Coslett Herbert Waddell | Allan Octavian Hume Coslett Herbert Waddell | 12/7/1904 | SLBI |
| Mentha | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | Coslett Herbert Waddell | 10/1894 | K |
| Mentha aquatica x spicata = M. x piperita | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | Alexander Goodman More Coslett Herbert Waddell | 2/10/1894 | DBN |
| Mentha aquatica x spicata = M. x piperita | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | | 2/10/1894 | DBN |
| Mentha spicata x suaveolens = M. x villosa | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | Coslett Herbert Waddell | 2/10/1894 | CGE |
| Mentha spicata x suaveolens = M. x villosa | IE, VCH38 Co. Down, Saul Cultivated | Coslett Herbert Waddell | Coslett Herbert Waddell Robert Lloyd Praeger | 9/1894 | DBN |
| Mentha spicata x suaveolens = M. x villosa | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | Coslett Herbert Waddell | 9/1894 | DBN |
| Mentha spicata x suaveolens = M. x villosa | IE, VCH38 Co. Down, Saul Cultivated | Coslett Herbert Waddell | Alexander Goodman More Coslett Herbert Waddell | 21/9/1894 | DBN |
| Mentha spicata x suaveolens = M. x villosa | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | National Museum Ireland Alexander Goodman More Coslett Herbert Waddell | 2/10/1894 | DBN |
| Mentha spicata x suaveolens = M. x villosa | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | Alexander Goodman More Coslett Herbert Waddell | 2/10/1894 | DBN |
| Mentha spicata x suaveolens = M. x villosa | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | | 2/10/1894 | DBN |
| Mentha spicata x suaveolens = M. x villosa | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | Coslett Herbert Waddell | 2/10/1894 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | | 2/10/1894 | LIV |
| Mentha spicata x suaveolens = M. x villosa | IE, VCH38 Co. Down, Saul Cultivated | Coslett Herbert Waddell | | 9/1895 | DBN |
| 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 |
+ | Mentha suaveolens x longifolia = M. x rotundifolia | IE, VCH38 Co. Down, Saul | Coslett Herbert Waddell | Charles Bailey | 8/1895 | MANCH |
| 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 |
| Rosa spinosissima x canina = R. x hibernica | IE, VCH38 Co. Down, Tillysburn | Coslett Herbert Waddell | Coslett Herbert Waddell | 15/6/1896 to 24/7/1896 | SLBI |
| Solidago virgaurea var. angustifolia | IE, VCH38 Co. Down, Tollymore Park | Coslett Herbert Waddell | Coslett Herbert Waddell William Hunt Painter | 9/1895 | ABS |
| Equisetum pratense | IE, VCH39 Co. Antrim, Belfast | Coslett Herbert Waddell | Watson Botanical Exchange Club Coslett Herbert Waddell Harold Stuart Thompson | 5/1901 | BIRM |
| Pilosella caespitosa x lactucella = P. x floribunda | IE, VCH39 Co. Antrim, Belfast, Cave Hill Cultivated | Coslett Herbert Waddell | Botanical Exchange Club of The British Isles Allan Octavian Hume Coslett Herbert Waddell | 8/1900 | SLBI |
| Rosa sherardii | IE, VCH39 Co. Antrim, Carnlough | Coslett Herbert Waddell | Botanical Exchange Club of The British Isles Coslett Herbert Waddell | 9/8/1910 | BIRM |
| 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 |
| 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 |
| 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 |
+ | 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 |
| Callitriche autumnalis | IE, VCH39 Co. Antrim, Lough Neagh | Coslett Herbert Waddell | Watson Botanical Exchange Club Augustin Ley Coslett Herbert Waddell | 13/8/1909 | BIRM |
| Rosa mollis | IE, VCH39 Co. Antrim, Whitewell, Belfast | Coslett Herbert Waddell | | 24/7/1896 | SLBI |
| Viola lutea | IE, VCH40 Co. Londonderry, Magilligan point | Coslett Herbert Waddell | Allan Octavian Hume Coslett Herbert Waddell | 5/1904 | SLBI |
| Draba muralis | IE, VCH40 Co. Londonderry, Umbra | Coslett Herbert Waddell Henry William Lett | Alfred Loydell William Robert Sherrin | 1905 | SLBI |
+ | Euphrasia nemorosa x brevipila | IE, Nantenan, near Askeaton, co. Limerick. [H8] | Coslett Herbert Waddell | | 11/9/1905 | MANCH |