| Mentha suaveolens x longifolia = M. x rotundifolia var. webberi | GB, VC28 West Norfolk, Marham | Frederick Robinson | | 27/8/1921 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC28 West Norfolk, Hockham | Frederick Robinson | Botanical Society & Exchange Club of The British Isles | 14/7/1921 | OXF |
| Mentha suaveolens x longifolia = M. x rotundifolia var. webberi | GB, VC83 Midlothian, Slateford | James Fraser | George Claridge Druce | 6/9/1920 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC19 North Essex, Alphamstone Cultivated | George Charles Brown | George Claridge Druce | 1/9/1920 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC12,VC22, Swallowfield | Gertrude Foggitt | Druce Herbarium, Oxford | 9/1920 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC70 Cumberland, Melmerby | | Druce Herbarium, Oxford | 9/1920 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC17 Surrey, Kew Green Cultivated GB, VC93 North Aberdeenshire, New Aberdour | J Fraser | J Fraser | 22/7/1920 | OXF |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC17 Surrey, Chiddingfold | George Claridge Druce | George Claridge Druce | 5/1920 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC2 East Cornwall, Liskeard | Todd | Todd George Claridge Druce | 1920 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, Cornwall | Todd | Druce Herbarium, Oxford | 1920 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC3 South Devon, Bovey Tracey | Todd | | 1920 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC17 Surrey, Pyrford | George Claridge Druce | | 1920 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC6 North Somerset, Weston in Gordano | Cedric Bucknall | Botanical Exchange Club of The British Isles Druce Herbarium, Oxford Arthur Bennett J Fraser | 8/9/1919 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC6 North Somerset, Weston in Gordano | Ida Mary Roper | Ida Mary Roper | 29/8/1919 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC6 North Somerset, Weston in Gordano | Ida Mary Roper | Ida Mary Roper | 27/8/1919 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC52 Anglesey, Beaumaris | George Claridge Druce | Druce Herbarium, Oxford | 8/1919 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC109 Caithness, John O'groats | George Claridge Druce | | 7/1919 | OXF |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC20 Hertfordshire, Northaw Cultivated | Spencer Henry Bickham | Druce Herbarium, Oxford Henry Elliott Fox Spencer Henry Bickham | 22/9/1918 | OXF |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC36 Herefordshire, Ledbury Cultivated | Spencer Henry Bickham | Botanical Exchange Club of The British Isles Druce Herbarium, Oxford Spencer Henry Bickham | 20/9/1918 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC6,VC34, Bristol Cultivated | James Walter White | Botanical Society & Exchange Club of The British Isles James Walter White | 9/1918 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC92 South Aberdeenshire, Alford | George Claridge Druce | | 8/1918 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC92 South Aberdeenshire, Alford | George Claridge Druce | | 8/1918 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC17 Surrey, Pyrford Rough | | George Claridge Druce | 1918 | OXF |
| Mentha rubra | GB, VC28 West Norfolk, Watton | | George Claridge Druce | 1918 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC78 Peeblesshire, Peebles | George Claridge Druce | | 9/1917 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC78 Peeblesshire, Peebles | George Claridge Druce | | 9/1917 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC79 Selkirkshire, Galashiels | George Claridge Druce | | 9/1917 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC80 Roxburghshire, Galashiels | George Claridge Druce | George Claridge Druce | 9/1917 | OXF |
| Mentha suaveolens x longifolia = M. x rotundifolia var. webberi | GB, VC64 Mid-west Yorkshire, Baildon | John Cryer | Botanical Exchange Club of The British Isles Druce Herbarium, Oxford John Cryer | 8/8/1917 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC54 North Lincolnshire, Woodhall Spa | Frank Simpson Alston | | 1917 | OXF |
| Mentha spicata x suaveolens = M. x villosa | GB, VC19 North Essex, Great Henny | John Bury Higgens | Druce Herbarium, Oxford | 10/1916 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC19 North Essex, Alphamstone Cultivated | George Charles Brown | Druce Herbarium, Oxford J Fraser | 7/9/1916 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC23 Oxfordshire, Wigginton | George Claridge Druce | George Claridge Druce | 9/1916 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC22,VC23, Oxford | F Gambier Parry | George Claridge Druce | 9/1916 | OXF |
| Mentha aquatica x spicata = M. x piperita | GB, VC41 Glamorganshire, Llanmadoc | George Claridge Druce | George Claridge Druce | 6/1916 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC64 Mid-west Yorkshire, Ribblehead | Edgar Marston Reynolds | | 1916 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC33 East Gloucestershire, Haymesgarth Cultivated | Charles Bailey | Botanical Society & Exchange Club of The British Isles Charles Bailey | 10/9/1915 | OXF |
| Mentha arvensis x spicata = M. x gracilis | GB, VC19 North Essex, Middleton | George Claridge Druce | | 9/1915 | OXF |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC19 North Essex, Twinstead | George Claridge Druce | George Claridge Druce | 9/1915 | OXF |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC20 Hertfordshire, Roydon | George Claridge Druce | | 9/1915 | OXF |