| Rumex dentatus | GB, VC28 West Norfolk, Wretton Fen | Joseph Edward Little | Isaac A Helsby Watson Botanical Exchange Club | 10/8/1925 | SLBI |
| Seseli libanotis | GB, VC29 Cambridgeshire, Cherry Hinton | Albert John Crosfield | Watson Botanical Exchange Club Isaac A Helsby | 11/8/1925 | SLBI |
| Malva pusilla | GB, VC34 West Gloucestershire, Avonmouth | Ida Mary Roper | Watson Botanical Exchange Club Isaac A Helsby | 28/10/1925 | SLBI |
| Lepidium sativum | GB, VC34 West Gloucestershire, Redland, Bristol | Ida Mary Roper | Isaac A Helsby Watson Botanical Exchange Club | 3/8/1927 | SLBI |
| Tilia platyphyllos | GB, VC34 West Gloucestershire, Stoke Bishop Cultivated | | Watson Botanical Exchange Club Isaac A Helsby | 9/7/1924 6/9/1924 | SLBI |
| Sonchus asper | GB, VC34 West Gloucestershire, Wickwar | | Watson Botanical Exchange Club Ida Mary Roper Isaac A Helsby | 20/7/1927 | SLBI |
| Draba aizoides | GB, VC41 Glamorganshire, Pennard Castle | Isaac A Helsby | Watson Botanical Exchange Club Isaac A Helsby | 12/4/1924 | SLBI |
| Linaria repens | GB, VC41 Glamorganshire, Porthcawl | Cundall | Watson Botanical Exchange Club Isaac A Helsby | 16/6/1906 | SLBI |
| Inula crithmoides | GB, VC45 Pembrokeshire, Tenby | M Brown | Isaac A Helsby Watson Botanical Exchange Club | | SLBI |
| Dianthus deltoides | GB, VC49 Caernarvonshire, Llandudno | Isaac A Helsby | Watson Botanical Exchange Club Isaac A Helsby | | SLBI |
| Silene nutans | GB, VC49 Caernarvonshire, Llandudno | Isaac A Helsby | Watson Botanical Exchange Club Isaac A Helsby | 29/5/1926 | SLBI |
| Petasites hybridus | GB, VC57 Derbyshire, Miller's Dale | Ida Mary Roper | Watson Botanical Exchange Club Isaac A Helsby | 16/5/1924 | SLBI |
| Myosotis sylvatica | GB, VC65 North-west Yorkshire, Jervaulx Abbey | Joseph Edward Little | Watson Botanical Exchange Club Isaac A Helsby | 3/6/1925 | SLBI |
| Empetrum nigrum | GB, VC65 North-west Yorkshire, Sowden Beck | Joseph Edward Little | Isaac A Helsby Watson Botanical Exchange Club | 3/6/1925 | SLBI |
| Bartsia alpina | GB, VC66 County Durham, Teesdale, Widdybank Fell | | Watson Botanical Exchange Club Isaac A Helsby Job Edward Lousley | 7/1927 | SLBI |
| Galium boreale | GB, Perthshire, Killin | Isaac A Helsby | Watson Botanical Exchange Club Isaac A Helsby Job Edward Lousley | 1928 | SLBI |
| Herniaria glabra | GB, VC113 Channel Islands, Guernsey, Cobo Common | Job Edward Lousley | Isaac A Helsby Watson Botanical Exchange Club | 13/6/1926 | SLBI |
| Lythrum hyssopifolia | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | Job Edward Lousley | Watson Botanical Exchange Club Isaac A Helsby | 23/6/1926 | SLBI |
| Echium plantagineum | GB, VC113 Channel Islands, Jersey,West Mount | Job Edward Lousley | Watson Botanical Exchange Club Isaac A Helsby | 16/6/1926 | SLBI |
| Petrorhagia prolifera | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | Job Edward Lousley | Isaac A Helsby Watson Botanical Exchange Club | 20/6/1926 | SLBI |
| Lotus angustissimus | GB, Cornwall, Cornwall Cultivated | Louis Arsene | Isaac A Helsby | 1/7/1930 | SLBI |
| Ranunculus paludosus | GB, VC113 Channel Islands, Jersey | Louis Arsene | Isaac A Helsby | 1/5/1925 | SLBI |
| Trifolium strictum | GB, VC113 Channel Islands, Jersey | Louis Arsene | Isaac A Helsby | 18/5/1926 | SLBI |
| Inula crithmoides | GB, VC113 Channel Islands, Jersey | Louis Arsene | Isaac A Helsby | 6/1928 | SLBI |
| Oxalis tetraphylla | GB, VC113 Channel Islands, Jersey, La Haule | Louis Arsene | Orvees Botanical Society Isaac A Helsby | 10/9/1928 | SLBI |
| Senecio lanuginosus | GB, VC113 Channel Islands, Jersey, Quennevais | Louis Arsene | Isaac A Helsby | 4/4/1926 | SLBI |
| Herniaria glabra | GB, VC113 Channel Islands, Jersey, Saint Aubins Bay | Louis Arsene | Isaac A Helsby | | SLBI |
| Juncus capitatus | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | Louis Arsene | Isaac A Helsby | 10/5/1925 | SLBI |
| Lotus angustissimus | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | Louis Arsene | Isaac A Helsby | 6/7/1925 | SLBI |
| Lotus subbiflorus | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | Louis Arsene | Isaac A Helsby | 6/7/1925 | SLBI |
| Malva parviflora | GB, VC113 Channel Islands, Jersey, Saint Helier | Louis Arsene | Isaac A Helsby | 15/7/1926 | SLBI |
| Raphanus raphanistrum subsp. maritimus | GB, VC113 Channel Islands, Jersey, Saint Helier | Louis Arsene | Isaac A Helsby | 1/7/1928 | SLBI |
| Raphanus raphanistrum subsp. maritimus | GB, VC113 Channel Islands, Jersey, Saint Heliers | Louis Arsene | Botanical Society & Exchange Club of The British Isles Isaac A Helsby | 1/7/1928 | SLBI |
| Spergularia media | GB, VC113 Channel Islands, Jersey, Saint Ouen's | Louis Arsene | Isaac A Helsby | 20/7/1926 | SLBI |
| Gnaphalium luteoalbum | GB, VC113 Channel Islands, Jersey, Saint Ouen's | Louis Arsene | Isaac A Helsby | 3/7/1928 | SLBI |
| Bupleurum baldense | GB, VC113 Channel Islands, Jersey, Saint Ouen's Bay | Louis Arsene | Isaac A Helsby | 12/7/1930 | SLBI |
| Vicia cassubica | GB, VC113 Channel Islands, Jersey, Saint Peters | Louis Arsene | Isaac A Helsby | 15/7/1926 | SLBI |
| Tuberaria guttata | GB, VC113 Channel Islands, Jersey,Beauport | Louis Arsene | Isaac A Helsby | 8/6/1926 | SLBI |
| Coincya monensis | GB, VC113 Channel Islands, Jersey,Corbiere | Louis Arsene | Isaac A Helsby | 6/6/1926 | SLBI |
| Silene gallica | GB, VC113 Channel Islands, Jersey,West Mount | Louis Arsene | Isaac A Helsby | 30/4/1925 | SLBI |