| Hymenophyllum wilsonii | GB, VC49 Caernarvonshire, Dolbadarn Castle | Arthur Langford Still | Harold Stuart Thompson Edward Charles Wallace | 27/6/1936 | BIRM |
| Hypochaeris glabra | GB, VC41 Glamorganshire, Merthyr Mawr Warren | Arthur Langford Still | Edward Charles Wallace Job Edward Lousley | 21/6/1925 | SLBI |
| Lithospermum purpureocaeruleum | GB, VC6 North Somerset, Axbridge | Arthur Langford Still | Edward Charles Wallace Job Edward Lousley | 4/6/1924 | SLBI |
| Lotus angustissimus | GB, VC17 Surrey, Wonersh | Arthur Langford Still | Job Edward Lousley | 13/8/1935 | SLBI |
| Melittis melissophyllum | GB, VC4 North Devon, Hartland | Arthur Langford Still | Job Edward Lousley | 10/6/1941 | SLBI |
| Mentha aquatica | GB, VC17 Surrey, Shalford | Arthur Langford Still S A Chambers | S A Chambers | 27/9/1932 | SLBI |
| Mentha aquatica | GB, VC41 Glamorganshire, Parkmill | Arthur Langford Still | Job Edward Lousley | 10/9/1934 | SLBI |
| Mentha aquatica | GB, VC41 Glamorganshire, Bishopston | Arthur Langford Still | Edward Charles Wallace Job Edward Lousley | 13/8/1934 | SLBI |
| Mentha aquatica | GB, VC17 Surrey, Great Bookham Common | Arthur Langford Still | Edward Charles Wallace Job Edward Lousley | 3/8/1934 | SLBI |
| Mentha aquatica | GB, VC41 Glamorganshire, Llanrhidian | Arthur Langford Still | Edward Charles Wallace Job Edward Lousley | 12/8/1934 | SLBI |
| Mentha aquatica | GB, VC17 Surrey, Wallington Cultivated GB, VC2 East Cornwall, Boscastle | Arthur Langford Still | Job Edward Lousley | 1/8/1940 | K |
| Mentha aquatica | GB, VC17 Surrey, Wallington Cultivated | Arthur Langford Still | | 21/5/1935 | SLBI |
| Mentha aquatica | GB, VC17 Surrey, Wallington Cultivated | Arthur Langford Still | Botanical Exchange Club of The British Isles | 6/9/1936 | SLBI |
| Mentha aquatica | GB, VC1 West Cornwall, Ruan Major | Arthur Langford Still | | 22/8/1935 | SLBI |
| Mentha aquatica | GB, VC1 West Cornwall, Perranwell | Arthur Langford Still | | 22/8/1935 | SLBI |
| Mentha aquatica | GB, VC17 Surrey, Chiddingfold | Arthur Langford Still | | 8/8/1938 | SLBI |
| Mentha aquatica | GB, VC17 Surrey, Wallington Cultivated GB, VC20 Hertfordshire, Roydon | Arthur Langford Still | Botanical Exchange Club of The British Isles | 6/9/1936 | K |
| Mentha aquatica | GB, VC20 Hertfordshire, Royston | Arthur Langford Still | Arthur Langford Still | 29/9/1935 | K |
| Mentha aquatica | GB, VC17 Surrey, Holmwood Common | Arthur Langford Still | | 3/9/1935 | K |
| Mentha aquatica | GB, East Yorkshire, Warthill | | Arthur Langford Still Harold Stuart Thompson | 9/1885 | BIRM |
| Mentha aquatica var. weiheana | GB, VC17 Surrey, Woking | Arthur Langford Still Edward Charles Wallace | Edward Charles Wallace | 6/9/1935 | K |
| Mentha aquatica x spicata = M. x piperita | GB, VC14 East Sussex, Danehill | Arthur Langford Still | Botanical Exchange Club of The British Isles Druce Herbarium, Oxford Edward Charles Wallace | 8/9/1926 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC36 Herefordshire, Ledbury | Francis Morland Day | Arthur Langford Still | 29/8/1940 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Chiddingfold | Arthur Langford Still | Job Edward Lousley | 5/9/1937 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Wallington Cultivated GB, VC37 Worcestershire, Alfrick | Arthur Langford Still | Job Edward Lousley | 9/1940 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC90 Angus, Fern Den | Arthur Langford Still | Job Edward Lousley | 20/8/1937 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC41 Glamorganshire, Llangennith | Arthur Langford Still | Edward Charles Wallace Job Edward Lousley | 11/8/1934 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC24 Buckinghamshire, Iver | Arthur Langford Still | Job Edward Lousley | 21/9/1935 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC3 South Devon, Aveton Gifford | Arthur Langford Still | Job Edward Lousley | 21/8/1935 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Wallington Cultivated GB, VC20 Hertfordshire, Roydon | Arthur Langford Still | Botanical Exchange Club of The British Isles | 6/9/1936 | OXF |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC17 Surrey, Chiddingfold | Arthur Langford Still | Joseph Norman Frankland | 5/9/1937 | LIV |
| Mentha aquatica x spicata = M. x piperita | GB, VC2 East Cornwall, Boscastle | Arthur Langford Still | Job Edward Lousley | 1/8/1940 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC41 Glamorganshire, Llangennith,Coity Green | Arthur Langford Still | Job Edward Lousley | 2/9/1937 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC14 East Sussex, Danehill | Arthur Langford Still | Botanical Exchange Club of The British Isles Job Edward Lousley | 8/9/1936 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Wallington Cultivated GB, VC6 North Somerset, Weston in Gordano | Arthur Langford Still | | 8/1937 | OXF |
+ | Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC17 Surrey, Chiddingfold | Arthur Langford Still | | 23/9/1934 | BIRM |
| Mentha aquatica x spicata = M. x piperita | GB, VC90 Angus, Brechin,Fern Den | Arthur Langford Still | | | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC6 North Somerset, East Harptree | Arthur Langford Still | | 23/8/1938 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC24 Buckinghamshire, Iver | Arthur Langford Still | | 21/9/1935 | SLBI |
| Mentha aquatica x spicata = M. x piperita | GB, VC14 East Sussex, Danehill | Arthur Langford Still | Botanical Exchange Club of The British Isles | 8/9/1936 | SLBI |