| Mentha spicata x suaveolens = M. x villosa | GB, VC1 West Cornwall, Bissoe | Spencer Henry Bickham | Spencer Henry Bickham | 21/8/1908 | CGE |
| Mentha spicata x suaveolens = M. x villosa | GB, VC1 West Cornwall, Bissoe | Frederick Hamilton Davey Spencer Henry Bickham | | 1/10/1904 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC1 West Cornwall, Burnthouse | Frederick Hamilton Davey | Frederick Hamilton Davey | 23/8/1903 | CGE |
| Mentha spicata x suaveolens = M. x villosa | GB, VC1 West Cornwall, Carnon Downs, Kea | Frederick Hamilton Davey | Watson Botanical Exchange Club Frederick Hamilton Davey | 9/10/1907 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Crantock | Spencer Henry Bickham | Spencer Henry Bickham | 6/10/1904 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Crantock | Spencer Henry Bickham | Spencer Henry Bickham | 6/10/1904 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Crantock | Spencer Henry Bickham | Spencer Henry Bickham | 5/10/1904 | CGE |
| Mentha spicata x suaveolens = M. x villosa | GB, VC1 West Cornwall, Feock | Frederick Hamilton Davey | Frederick Hamilton Davey | 9/9/1907 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Goonhavern | Chambre Corker Vigurs | Frederick Hamilton Davey | 1/9/1912 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Goonhavern | Chambre Corker Vigurs | Watson Botanical Exchange Club Joseph Edward Little Frederick Hamilton Davey | 9/1912 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Goonhavern | Chambre Corker Vigurs | | 1/9/1912 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Gwennap | Frederick Hamilton Davey Spencer Henry Bickham | Spencer Henry Bickham | 1/10/1904 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Gwennap | Cyril West | | 9/1948 | CGE |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC1 West Cornwall, Gwennap | Frederick Hamilton Davey | Frederick Hamilton Davey | 30/8/1911 | CGE |
| Mentha spicata x suaveolens = M. x villosa | GB, VC1 West Cornwall, Gwennap | Frederick Hamilton Davey | | 30/8/1911 | CGE |
| Mentha spicata x suaveolens = M. x villosa | GB, VC1 West Cornwall, Gwennap | Frederick Hamilton Davey | Frederick Hamilton Davey | 24/8/1911 | CGE |
| Mentha spicata x suaveolens = M. x villosa | GB, VC1 West Cornwall, Gwennap | Frederick Hamilton Davey | Frederick Hamilton Davey | 30/8/1911 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Helston | James Cunnack | Botanical Exchange Club of The British Isles John Durbin Gray | 9/1881 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Helston | John Ralfs | Charles Cardale Babington | 26/8/1878 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Hick's Mill, Gwennap | Cyril West | | 9/1946 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Hick's Mill, Gwennap | Cyril West | | 9/1948 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC1 West Cornwall, Hick's Mill, Gwennap | Frederick Hamilton Davey | Frederick Hamilton Davey | 30/8/1911 | CGE |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC1 West Cornwall, Lamorna | William Curnow | | 8/1879 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Lizard | James Cunnack | Charles Cardale Babington | 7/1878 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC1 West Cornwall, Loe Pool | Christopher Donald Pigott | | 8/1947 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Mullion | James Cunnack | Charles Cardale Babington | 8/1882 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Newquay | Chambre Corker Vigurs | A Hosking Edward Morell Holmes | 8/1904 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC1 West Cornwall, Newquay | Joseph Edward Little | | 1903 | CGE |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC1 West Cornwall, Paul | Cyril West | | 9/1948 | CGE |
| Mentha aquatica x spicata = M. x piperita var. citrata | GB, VC1 West Cornwall, Paul | Cyril West | | 9/1948 | CGE |
| Mentha spicata x suaveolens = M. x villosa | GB, VC1 West Cornwall, Paul | Cyril West | | 9/1948 | CGE |
| Mentha spicata x suaveolens = M. x villosa | GB, VC1 West Cornwall, Paul | C West | | 9/1948 | CGE |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC1 West Cornwall, Perranarworthal | Frederick Hamilton Davey | Watson Botanical Exchange Club Frederick Hamilton Davey Spencer Henry Bickham | 3/8/1911 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC1 West Cornwall, Ponsanooth | Frederick Hamilton Davey | Watson Botanical Exchange Club Frederick Hamilton Davey | 19/9/1902 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC1 West Cornwall, Ponsanooth | Frederick Hamilton Davey | Spencer Henry Bickham | 23/8/1903 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC1 West Cornwall, Ponsanooth | Frederick Hamilton Davey Spencer Henry Bickham | Spencer Henry Bickham | 1/10/1904 | CGE |
| Mentha arvensis x spicata = M. x gracilis | GB, VC1 West Cornwall, Ponsanooth | | Frederick Hamilton Davey | 19/9/1902 | CGE |
| Mentha spicata x suaveolens = M. x villosa | GB, VC1 West Cornwall, Ponsanooth GB, VC9 Dorset, Edmondsham Cultivated | Edward Francis Linton | Edward Francis Linton | 7/10/1907 | CGE |
| Mentha arvensis x aquatica x spicata = M. x smithiana | GB, VC1 West Cornwall, Porkellis | Frederick Hamilton Davey | Watson Botanical Exchange Club Albert John Crosfield | 9/9/1907 | CGE |
| Mentha aquatica x spicata = M. x piperita | GB, VC1 West Cornwall, Praa Sands | William Curnow | Henry & James Groves Spencer Henry Bickham | 8/1882 | CGE |