| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC58 Cheshire, Chester | Christopher Robert Billups | Alfred Fryer Charles Bailey | 24/7/1897 | MANCH |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC58 Cheshire, Chester | Christopher Robert Billups | Charles Bailey | 24/7/1897 | MANCH |
+ | Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC58 Cheshire, Chester | Christopher Robert Billups | | 24/7/1897 | BIRM |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC58 Cheshire, Chester | Christopher Robert Billups | Botanical Exchange Club of The British Isles Augustin Ley | 24/7/1897 | BIRM |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC86 Stirlingshire, Falkirk | Robert Kidston | Botanical Exchange Club of The British Isles Charles Bailey | 1/9/1897 | MANCH |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC86 Stirlingshire, Falkirk | Robert Kidston | Alfred Fryer Charles Bailey | 1/9/1897 | MANCH |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC86 Stirlingshire, Falkirk | John Stirling Stirling Robert Kidston | Botanical Exchange Club of The British Isles | 1/9/1897 | ABS |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC55 Leicestershire, Loughborough | Albert Bruce Jackson | Botanical Exchange Club of The British Isles Albert Bruce Jackson Charles Bailey | 8/1898 | MANCH |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC55 Leicestershire, Loughborough | Albert Bruce Jackson | Botanical Exchange Club of The British Isles Charles Bailey | 8/1898 | MANCH |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC55 Leicestershire, Loughborough | Albert Bruce Jackson | Albert Bruce Jackson Charles Bailey | 8/1898 | MANCH |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC55 Leicestershire, Loughborough | Albert Bruce Jackson | Botanical Exchange Club of The British Isles Albert Bruce Jackson Augustin Ley | 8/1898 | BIRM |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC55 Leicestershire, Loughborough Canal | Albert Bruce Jackson | Botanical Exchange Club of The British Isles | 8/1898 | ABS |
+ | Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC55 Leicestershire, Grand Union Canal at Loughborough | Albert Bruce Jackson | | 8/1898 | BIRM |
+ | Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC57 Derbyshire, Derby | William Richardson Linton | | 20/8/1900 | BIRM |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC57 Derbyshire, Shirley Cultivated | William Richardson Linton | Botanical Exchange Club of The British Isles Augustin Ley William Richardson Linton | 20/8/1900 | BIRM |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC55 Leicestershire, Quorndon | Frances Louisa Foord-Kelcey | Botanical Exchange Club of The British Isles Manchester Museum Charles Bailey | 19/8/1907 | MANCH |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC64 Mid-west Yorkshire, Ilkley | Albert Wilson | Botanical Exchange Club of The British Isles Augustin Ley | 8/1910 | BIRM |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC64 Mid-west Yorkshire, Ilkley | Albert Wilson | | 8/1910 | MANCH |
+ | Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC64 Mid-west Yorkshire, River Wharfe at Ilkley | A Wilson | | 8/1910 | BIRM |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC20 Hertfordshire, Grand Union Canal at Little Tring | George Taylor | The British Museum | 2/8/1939 | BIRM |
+ | Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC20 Hertfordshire, Grand Union Canal at Little Tring | G Taylor | | 2/8/1939 | BIRM |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC56 Nottinghamshire, Wiseton,Drakeholes | George Taylor | | 2/8/1941 | MANCH |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC56 Nottinghamshire, Gringley on the Hill | George Taylor | | 7/6/1944 | SLBI |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC24 Buckinghamshire, Marsworth, Startop's End | James Edgar Dandy Job Edward Lousley | | 17/6/1944 | SLBI |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC56 Nottinghamshire, East Retford | George Taylor | | 10/7/1946 | SLBI |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC39 Staffordshire, Lichfield | Job Edward Lousley | Job Edward Lousley | 7/1949 | SLBI |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC20 Hertfordshire, Tring | James Edgar Dandy | The British Museum | 14/8/1949 | MANCH |