| Mentha x muelleriana | GB, VC3 South Devon, Salcombe GB, VC3 South Devon, Scabbacombe Cultivated | Francis Morland Day | | 20/8/1937 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC33 East Gloucestershire, Compton Abdale | Francis Morland Day | | 21/8/1937 | K |
| Mentha piperita var. piperita | GB, VC23,VC33, Little Barrington | Francis Morland Day | | 23/8/1937 | K |
| Mentha spicata x suaveolens = M. x villosa | GB, VC23,VC33, Little Barrington | Francis Morland Day | | 23/8/1937 | K |
| Mentha aquatica | GB, VC33 East Gloucestershire, Chedworth | Francis Morland Day | | 26/8/1937 | K |
| Mentha piperita var. piperita | GB, VC33 East Gloucestershire, Chedworth | Francis Morland Day | | 26/8/1937 | K |
| Mentha x verticillata var. rivalis | GB, VC3 South Devon, Stoke Gabriel | Francis Morland Day | | 2/9/1937 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC3 South Devon, Bovey Tracey | Francis Morland Day | | 16/9/1937 | K |
| Mentha spicata | GB, VC3 South Devon, Heathfield | Francis Morland Day | | 16/9/1937 | K |
| Mentha spicata | GB, VC3 South Devon, Heathfield | Francis Morland Day | Job Edward Lousley | 17/9/1937 | K |
| Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Chudleigh Knighton | Francis Morland Day | | 18/9/1937 | K |
| Mentha piperita var. piperita | GB, VC36 Herefordshire, Colwall | Francis Morland Day | | 25/9/1937 | K |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC36 Herefordshire, Wellington | Francis Morland Day | | 28/9/1937 | K |
| Mentha x verticillata var. paludosa | GB, VC34 West Gloucestershire, Bromsberrow | Francis Morland Day | | 28/9/1937 | K |
| Mentha aquatica | GB, VC37 Worcestershire, Guarlford | Francis Morland Day | | 2/10/1937 | K |
| Mentha spicata | GB, VC34 West Gloucestershire, Dymock | Francis Morland Day | | 5/10/1937 | K |
| Mentha arvensis | GB, VC36 Herefordshire, Eastnor | Francis Morland Day | | 12/10/1937 | K |
| Mentha x verticillata var. paludosa | GB, VC36 Herefordshire, Eastnor Park | Francis Morland Day | | 12/10/1937 | K |
| Mentha arvensis var. austriaca | GB, VC36 Herefordshire, Colwall | Francis Morland Day | | 15/10/1937 | K |
| Festuca arundinacea | GB, VC36 Herefordshire, Colwall | Francis Morland Day | | 21/6/1938 | K |
| Mentha aquatica | GB, VC3 South Devon, Brixham | Francis Morland Day | | 5/8/1938 | K |
| Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Brixham | Francis Morland Day | | 5/8/1938 | K |
| Dactylis glomerata | GB, VC3 South Devon, Brixham | Francis Morland Day | | 8/8/1938 | K |
| Mentha suaveolens | GB, VC3 South Devon, Brixham | Francis Morland Day | | 10/8/1938 | K |
| Mentha aquatica | GB, VC3 South Devon, Alphington | Francis Morland Day | | 11/8/1938 | K |
| Mentha arvensis | GB, VC3 South Devon, Alphington | Francis Morland Day | | 11/8/1938 | K |
| Mentha arvensis | GB, VC3 South Devon, Exeter | Francis Morland Day | | 11/8/1938 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC3 South Devon, Brixham | Francis Morland Day | | 13/8/1938 | K |
| Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Brixham | Francis Morland Day | | 13/8/1938 | K |
| Mentha x muelleriana | GB, VC3 South Devon, Scabbacombe | Francis Morland Day | | 13/8/1938 | K |
| Mentha arvensis | GB, VC3 South Devon, Brixham | Francis Morland Day | | 14/8/1938 | K |
| Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Brixham | Francis Morland Day | | 17/8/1938 | K |
| Mentha arvensis | GB, VC3 South Devon, Widdecombe | Francis Morland Day | | 23/8/1938 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC3 South Devon, Widecombe in the Moor | Francis Morland Day | | 23/8/1938 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC25 East Suffolk, Holton | Francis Morland Day | | 3/9/1938 | K |
| Mentha aquatica | GB, VC25 East Suffolk, Beccles | Francis Morland Day | | 5/9/1938 | K |
| Mentha aquatica | GB, VC27 East Norfolk, Gillingham | Francis Morland Day | | 5/9/1938 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC25 East Suffolk, Beccles | Francis Morland Day | | 5/9/1938 | 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 |