| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC86 Stirlingshire, Falkirk | John Stirling Stirling Robert Kidston | Alfred Fryer | 24/8/1894 | SLBI |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, Ambiguous locality (GB), River Dee Cultivated | Alfred Fryer | Allan Octavian Hume Arthur Bennett | 31/8/1892 | SLBI |
| Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC57 Derbyshire, Ockbrook | Alexander Cossart Hasse | Alexander Cossart Hasse | 6/1884 | MANCH |
+ | 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, 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, VC64 Mid-west Yorkshire, Wetherby | J Jackson | George Stephen West | 1885 | BIRM |
+ | Potamogeton perfoliatus x crispus = P. x cooperi | GB, VC86 Stirlingshire, Falkirk | Robert Kidston | | 8/8/1892 | BIRM |
| 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, 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, 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, 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 | IE, VCH39 Co. Antrim, Templepatrick | Samuel Alexander Stewart | Botanical Exchange Club of The British Isles Augustin Ley | 10/8/1894 | 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, VC24 Buckinghamshire, Marsworth, Startop's End | James Edgar Dandy Job Edward Lousley | | 17/6/1944 | 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 | IE, VCH39 Co. Antrim, Sixmile River above Templepatrick | Samuel Alexander Stewart | | 10/8/1894 | BIRM |
| Potamogeton perfoliatus x crispus = P. x cooperi | IE, VCH39 Co. Antrim, Templepatrick | Samuel Alexander Stewart | | 10/8/1894 | ABS |
| Potamogeton perfoliatus x crispus = P. x cooperi | IE, VCH39 Co. Antrim, Templepatrick | Samuel Alexander Stewart | | 10/8/1894 | SLBI |
| 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, VC20 Hertfordshire, Grand Union Canal at Little Tring | G Taylor | | 2/8/1939 | BIRM |
| 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, VC56 Nottinghamshire, Gringley on the Hill | George Taylor | | 7/6/1944 | SLBI |
| 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, VC86 Stirlingshire, Falkirk | | | | SLBI |
| Potamogeton perfoliatus x crispus = P. x cooperi | IE, VCH39 Co. Antrim, Templepatrick | | | | SLBI |
+ | 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, VC64 Mid-west Yorkshire, Ilkley | Albert Wilson | | 8/1910 | MANCH |