| Lavatera cretica | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | Louis Arsene | Botanical Exchange Club of The British Isles Job Edward Lousley Louis Arsene | 15/7/1926 | SLBI |
| Lotus angustissimus | GB, VC113 Channel Islands, Saint Lawrence's Valley, Jersey | Louis Arsene | Botanical Exchange Club of The British Isles Job Edward Lousley Louis Arsene | 1/7/1930 | SLBI |
| Lotus angustissimus | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | Louis Arsene | Isaac A Helsby | 6/7/1925 | SLBI |
| Lotus angustissimus | GB, Cornwall, Cornwall Cultivated | Louis Arsene | Isaac A Helsby | 1/7/1930 | SLBI |
| Lotus subbiflorus | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | Louis Arsene | Isaac A Helsby | 6/7/1925 | SLBI |
| Ludwigia palustris | CA, Quebec, Laprairie | Louis Arsene | Job Edward Lousley Louis Arsene | 9/8/1927 | SLBI |
+ | Lythrum hyssopifolia | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | Louis Arsene | Botanical Society & Exchange Club of The British Isles | 1/8/1926 | MANCH |
| Lythrum hyssopifolia | GB, VC113 Channel Islands, Jersey, Saint Catherine's Bay | Louis Arsene | Botanical Exchange Club of The British Isles Job Edward Lousley | 1/8/1926 | SLBI |
| Malva parviflora | GB, VC113 Channel Islands, Jersey, Saint Helier | Louis Arsene | Isaac A Helsby | 15/7/1926 | SLBI |
+ | Matthiola sinuata | GB, VC113 Channel Islands, Jersey, Saint Ouen's Bay | Louis Arsene | Botanical Society & Exchange Club of The British Isles | 7/7/1926 | MANCH |
| Matthiola sinuata | GB, VC113 Channel Islands, Jersey, Saint Ouen's Bay | Louis Arsene | Botanical Exchange Club of The British Isles Job Edward Lousley Louis Arsene | 5/6/1926 7/7/1926 | SLBI |
| Oenanthe pimpinelloides | GB, VC113 Channel Islands, Saint Saviour's Jersey | Louis Arsene | Isaac A Helsby | 11/10/1927 | SLBI |
| Orchis morio | GB, VC113 Channel Islands, Jersey, Saint Ouens Pond | Louis Arsene | | 8/5/1926 | K |
| Oxalis tetraphylla | GB, VC113 Channel Islands, Jersey, La Haule | Louis Arsene | Orvees Botanical Society Isaac A Helsby | 10/9/1928 | SLBI |
| Parentucellia viscosa | GB, VC113 Channel Islands, Jersey | Louis Arsene | Botanical Exchange Club of The British Isles Job Edward Lousley Louis Arsene | 15/7/1926 | SLBI |
| Petrorhagia prolifera | GB, VC113 Channel Islands, Les Quennevais | Louis Arsene | Botanical Exchange Club of The British Isles Job Edward Lousley Louis Arsene | 15/6/1926 7/7/1926 | SLBI |
| Plantago maritima | GB, VC113 Channel Islands, Jersey | Louis Arsene | Horti Botanici Bruxellensis Société française pour l'échange des plantes vasculaires | 28/7/1948 | K |
| Polycarpon tetraphyllum | GB, VC113 Channel Islands, Jersey, Grosnez | Louis Arsene | Botanical Exchange Club of The British Isles | 8/8/1928 | SLBI |
| Polycarpon tetraphyllum | GB, VC113 Channel Islands, Saint Lawrence's Valley, Jersey | Louis Arsene | Isaac A Helsby | 8/6/1926 | SLBI |
| Polygala vulgaris subsp. collina | GB, VC113 Channel Islands, Jersey | Louis Arsene | Botanical Exchange Club of The British Isles Job Edward Lousley Louis Arsene | 5/4/1926 | SLBI |
| Polygonum maritimum | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | Louis Arsene | Isaac A Helsby | 27/7/1926 | SLBI |
| Ranunculus paludosus | GB, VC113 Channel Islands, Jersey | Louis Arsene | Isaac A Helsby | 1/5/1925 | 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 |
| 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 Exchange Club of The British Isles Job Edward Lousley Louis Arsene | 1/7/1928 | SLBI |
| Raphanus raphanistrum subsp. maritimus | GB, VC113 Channel Islands, Jersey, Saint Heliers | Louis Arsene | Job Edward Lousley Louis Arsene | 1/7/1928 | SLBI |
+ | Romulea columnae | GB, VC113 Channel Islands, Jersey,Ouaisne | Louis Arsene | Botanical Society & Exchange Club of The British Isles | 3/3/1926 | MANCH |
| Rosa spinosissima | GB, VC113 Channel Islands, Jersey, Quennevais | Louis Arsene | Botanical Exchange Club of The British Isles Louis Arsene | 10/7/1928 | SLBI |
| Scabiosa atropurpurea | GB, VC113 Channel Islands, L'Etacq | Louis Arsene | Isaac A Helsby | 26/6/1926 | SLBI |
| Scilla autumnalis | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | Louis Arsene | Botanical Exchange Club of The British Isles Louis Arsene | 8/8/1929 | SLBI |
| Scirpus americanus | GB, VC113 Channel Islands, Jersey, Saint Ouen's | Louis Arsene | Botanical Exchange Club of The British Isles Louis Arsene Richard Charles L'Estrange Burges | 15/7/1926 | BIRM |
| Scrophularia scorodonia | GB, VC113 Channel Islands, Jersey, Saint Saviour | Louis Arsene | Botanical Exchange Club of The British Isles Job Edward Lousley | 1/7/1926 | SLBI |
| Scrophularia scorodonia | GB, VC113 Channel Islands, Jersey | Louis Arsene | Watson Botanical Exchange Club Job Edward Lousley | 1/7/1926 | SLBI |
| Senecio lanuginosus | GB, VC113 Channel Islands, Jersey, Quennevais | Louis Arsene | Isaac A Helsby | 4/4/1926 | SLBI |
| Senecio lanuginosus | GB, VC113 Channel Islands, Quenvais | Louis Arsene | Botanical Exchange Club of The British Isles Job Edward Lousley | 4/4/1926 | SLBI |
| Sibthorpia europaea | GB, VC113 Channel Islands, Saint Brelade, Jersey | Louis Arsene | Botanical Exchange Club of The British Isles Job Edward Lousley Louis Arsene | 21/7/1928 | SLBI |
| Sibthorpia europaea | GB, VC113 Channel Islands, Saint Brelade, Jersey | Louis Arsene | Louis Arsene | 21/6/1928 | K |
| Sibthorpia europaea | GB, VC113 Channel Islands, Saint Brelade, Jersey | Louis Arsene | Botanical Exchange Club of The British Isles Louis Arsene | 21/7/1928 | K |
| Sibthorpia europaea | GB, VC113 Channel Islands, Saint Brelade, Jersey | Louis Arsene | Botanical Exchange Club of The British Isles Charles Edward Britton Louis Arsene | 21/7/1928 | K |
| Silene conica | GB, VC113 Channel Islands, Saint Ouen's Bay, Jersey | Louis Arsene | Botanical Exchange Club of The British Isles Job Edward Lousley Louis Arsene | 14/5/1928 | SLBI |