| Mentha pulegium | GB, VC3 South Devon, Lannacombe Bay | Francis Morland Day | | 28/8/1935 | K |
| Mentha arvensis var. austriaca | GB, VC3 South Devon, Lustleigh | Francis Morland Day | | 16/8/1935 | K |
| Mentha arvensis var. allionii | GB, VC3 South Devon, Lustleigh | Francis Morland Day | | 22/8/1939 | K |
| Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Lustleigh | Francis Morland Day | | 22/8/1939 | K |
| Mentha gentilis var. resinosa | GB, VC3 South Devon, Lustleigh | Francis Morland Day | Job Edward Lousley | 1939 | K |
| Mentha pulegium | GB, VC3 South Devon, Malborough | Francis Morland Day | | 4/8/1935 | K |
| Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Marldon | Francis Morland Day | | 3/8/1937 | K |
| Mentha spicata | GB, VC3 South Devon, Newton Abbot | Francis Morland Day | | 18/9/1935 | K |
| Mentha spicata | GB, VC3 South Devon, Newton Abbot | Francis Morland Day | | 12/8/1940 | K |
| Mentha spicata x suaveolens = M. x villosa | GB, VC3 South Devon, Newton Abbot | Francis Morland Day | | 9/9/1935 | K |
| Mentha x cordifolia | GB, VC3 South Devon, Newton Abbot | Francis Morland Day | | 9/1935 | K |
| Viola lactea | GB, VC3 South Devon, Newton Abbot | Francis Morland Day William Keble Martin | | 23/4/1933 | K |
| Mentha x cordifolia | GB, VC3 South Devon, Paignton | Francis Morland Day | | 8/9/1941 | K |
| Mentha x muelleriana | GB, VC3 South Devon, Salcombe GB, VC3 South Devon, Scabbacombe Cultivated | Francis Morland Day | | 20/8/1937 | K |
| Mentha x muelleriana | GB, VC3 South Devon, Scabbacombe | Francis Morland Day | | 13/8/1938 | K |
| Mentha arvensis | GB, VC3 South Devon, Stoke Gabriel | Francis Morland Day | | 11/9/1938 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC3 South Devon, Stoke Gabriel | Francis Morland Day | | 11/9/1938 | K |
| Mentha x verticillata var. rivalis | GB, VC3 South Devon, Stoke Gabriel | Francis Morland Day | | 2/9/1937 | K |
| Mentha aquatica | GB, VC3 South Devon, Teigngrace | Francis Morland Day | | 9/9/1935 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC3 South Devon, Totnes | Francis Morland Day | Job Edward Lousley Arthur Langford Still | 17/9/1938 | SLBI |
| Mentha arvensis | GB, VC3 South Devon, Widdecombe | Francis Morland Day | | 23/8/1938 | K |
| Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Widdecombe | Francis Morland Day | | 17/8/1937 | K |
| Mentha arvensis | GB, VC3 South Devon, Widecombe in the Moor | Francis Morland Day | | 17/8/1937 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC3 South Devon, Widecombe in the Moor | Francis Morland Day | | 17/8/1937 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC3 South Devon, Widecombe in the Moor | Francis Morland Day | | 23/8/1938 | K |
| Mentha aquatica | GB, VC3 South Devon, Yalberton | Francis Morland Day | | 7/8/1935 | K |
| Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Yalberton | Francis Morland Day | | 11/8/1937 | K |
| Mentha arvensis | GB, VC4 North Devon, Braunton | Francis Morland Day | | 26/8/1925 | K |
| Mentha aquatica | GB, VC4 North Devon, Braunton Burrows | Francis Morland Day | | 22/8/1935 | K |
| Mentha longifolia | GB, VC5 South Somerset, Yeovil | Francis Morland Day | | 17/8/1955 | K |
| Dactylis glomerata | GB, VC6 North Somerset, Cheddar Gorge | Francis Morland Day | | 6/6/1952 | K |
| Mentha x verticillata var. paludosa | GB, VC6 North Somerset, Glastonbury | Francis Morland Day | | 14/8/1948 | K |
| Mentha spicata | GB, VC7 North Wiltshire, Avebury | Francis Morland Day | | 14/8/1950 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC9 Dorset, Cattistock | Francis Morland Day | | 21/8/1955 | K |
| Mentha arvensis | GB, VC20 Hertfordshire, Bricket Wood | Francis Morland Day | | 21/8/1946 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC20 Hertfordshire, Sarratt | Francis Morland Day | | 4/8/1942 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC20 Hertfordshire, Sarratt | Francis Morland Day | | 31/7/1943 | K |
| Mentha spicata | GB, VC20 Hertfordshire, Watford | Francis Morland Day O G Day Rex Alan Henry Graham | | 30/8/1950 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC21 Middlesex, Harefield | Francis Morland Day | | 5/8/1942 | K |
| Mentha gentilis var. gracilis | GB, VC21 Middlesex, Harefield | Francis Morland Day | | 28/8/1952 | K |