| Mentha spicata x longifolia = M. x villosonervata | GB, VC17 Surrey, Friday Street GB, VC17 Surrey, Kew Cultivated | J Fraser | Botanical Exchange Club of The British Isles Druce Herbarium, Oxford J Fraser | 30/8/1930 | OXF |
| Mentha spicata x suaveolens = M. x villosa | GB, VC54 North Lincolnshire, West Keal | | | 21/8/1930 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC33 East Gloucestershire, Compton Abdale | George Claridge Druce | | 1930 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC55 Leicestershire, Leicester | Geoffrey John Victor Bemrose | George Claridge Druce | 1930 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC43 Radnorshire, Glasbury | George Claridge Druce | | 9/1929 | OXF |
| Mentha spicata x longifolia = M. x villosonervata | GB, VC17 Surrey, Friday Street GB, VC17 Surrey, Kew Cultivated | J Fraser | Botanical Exchange Club of The British Isles Druce Herbarium, Oxford J Fraser | 24/8/1929 13/9/1929 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC93 North Aberdeenshire, Fyvie | F Turreff | George Claridge Druce | 8/1929 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC64 Mid-west Yorkshire, Cookridge | William Arthur Sledge | Botanical Exchange Club of The British Isles William Arthur Sledge | 26/9/1928 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC5 South Somerset, Cutcombe | G Amherst | | 14/9/1928 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC54 North Lincolnshire, Swaby | William Wright Mason | | 31/8/1928 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, Somerset, Cutcombe | Mason | Druce Herbarium, Oxford | 23/8/1928 | OXF |
| Mentha spicata x suaveolens = M. x villosa | GB, VC17 Surrey, Kew Cultivated GB, VC93 North Aberdeenshire, New Aberdour | J Fraser | Botanical Society & Exchange Club of The British Isles Druce Herbarium, Oxford J Fraser | 13/8/1928 to 19/8/1929 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC93 North Aberdeenshire, New Aberdour | J Fraser | J Fraser | 17/9/1927 | OXF |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC17 Surrey, Sanderstead | Job Edward Lousley | Job Edward Lousley | 4/9/1927 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Friday Street | J Fraser | Botanical Exchange Club of The British Isles J Fraser | 28/8/1927 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC93 North Aberdeenshire, Fyvie | F Turreff | | 7/1927 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC43 Radnorshire, Bough Wood | | Druce Herbarium, Oxford | 1927 | OXF |
| Mentha aquatica x spicata = M. x piperita | IE, VCH1 South Kerry, Kenmare | George Claridge Druce | Druce Herbarium, Oxford | 1927 | OXF |
| Mentha arvensis x spicata = M. x gracilis | IE, Cork, Mallow | George Claridge Druce | Druce Herbarium, Oxford | 1927 | OXF |
| Mentha suaveolens x longifolia = M. x rotundifolia var. webberi | GB, VC90 Angus, Netherton | Margaret Corstorphine Robert Henry Corstorphine | R & M Corstorphine | 26/9/1926 | OXF |
| 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 spicata x suaveolens = M. x villosa | GB, VC23 Oxfordshire, Oxford | George Claridge Druce | | 9/1926 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC27 East Norfolk, Burgh Saint Margaret | Rowland John Burdon | | 25/8/1926 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC17 Surrey, Woking | J Fraser | J Fraser | 15/8/1926 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC17 Surrey, Wallington Cultivated | Arthur Langford Still | | 8/1926 | OXF |
| Mentha spicata x suaveolens = M. x villosa | GB, VC105 West Ross & Cromarty, Gruinard | George Claridge Druce | Druce Herbarium, Oxford | 1926 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC12 North Hampshire, Biddesden | George Claridge Druce | | 10/1925 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC6 North Somerset, Walton in Gordano | James Walter White | | 25/8/1925 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC17 Surrey, Woking | J Fraser | J Fraser | 23/8/1925 | OXF |
| Mentha suaveolens x longifolia = M. x rotundifolia var. webberi | GB, VC64 Mid-west Yorkshire, Hawksworth | John Cryer | Botanical Society & Exchange Club of The British Isles Druce Herbarium, Oxford John Cryer | 14/8/1925 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC19 North Essex, Colchester | George Charles Brown | Botanical Exchange Club of The British Isles | 9/8/1925 16/8/1925 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC112 Shetland, Bay of Scousburgh | George Claridge Druce | | 8/1924 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC70 Cumberland, Drigg | Robert Hardy Williamson | George Claridge Druce | 1924 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC70 Cumberland, Drigg | Robert Hardy Williamson | | 1924 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Penzance | Edgar A Rees | Druce Herbarium, Oxford | 7/10/1923 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC6 North Somerset, Weston in Gordano | James Walter White | Botanical Exchange Club of The British Isles | 4/10/1923 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC19 North Essex, Peldon | George Charles Brown Herbert Stanley Redgrove | Druce Herbarium, Oxford | 30/8/1923 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC111 Orkney, Stenness | Henry Halcro Johnston | | 18/10/1922 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC19 North Essex, Little Maplestead | George Claridge Druce | George Claridge Druce | 9/1922 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC8 South Wiltshire, Bedwyn Brail | Cecil Prescott Hurst | Druce Herbarium, Oxford | 14/7/1922 | OXF |