| Salix triandra x viminalis = S. x mollissima | GB, VC29 Cambridgeshire, Over | J Gina Murrell Peter Derek Sell | | 30/1/1992 | CGE |
| Salix fragilis x alba = S. x rubens | GB, VC29 Cambridgeshire, Pymore | Peter Derek Sell | | 18/5/1972 | CGE |
| Salix caprea x cinerea = S. x reichardtii | GB, VC29 Cambridgeshire, Sawston Moor | Christopher David Preston Peter Derek Sell | | 16/6/1987 | CGE |
| Salix caprea x cinerea = S. x reichardtii | GB, VC29 Cambridgeshire, Sutton | J Gina Murrell Peter Derek Sell | | 29/8/1991 | CGE |
| Salix triandra x viminalis = S. x mollissima | GB, VC29 Cambridgeshire, Sutton Gault | A Clark L Nicol Peter Derek Sell | | 25/7/1988 | CGE |
| Salix triandra x viminalis = S. x mollissima | GB, VC29 Cambridgeshire, Sutton Gault | A Clark L Nicol Peter Derek Sell | | 25/7/1988 | CGE |
| Salix fragilis x alba = S. x rubens | GB, VC29 Cambridgeshire, Swavesey | J Gina Murrell Peter Derek Sell | | 29/8/1991 | CGE |
| Salix caprea x cinerea = S. x reichardtii | GB, VC29 Cambridgeshire, Teversham | J Gina Murrell Peter Derek Sell | | 15/6/1988 | CGE |
| Salix caprea x cinerea = S. x reichardtii | GB, VC29 Cambridgeshire, Teversham | J Gina Murrell Peter Derek Sell | | 15/6/1988 | CGE |
| Salix caprea x cinerea = S. x reichardtii | GB, VC29 Cambridgeshire, Teversham | J Gina Murrell Peter Derek Sell | | 15/6/1988 | CGE |
| Salix alba x babylonica = S. x sepulcralis var. chrysocoma | GB, VC29 Cambridgeshire, Wendy | Peter Derek Sell | | 3/7/1966 | CGE |
| Salix alba x babylonica = S. x sepulcralis var. chrysocoma | GB, VC29 Cambridgeshire, Wendy | Peter Derek Sell | | 24/4/1987 | CGE |
| Salix pentandra x fragilis = S. x meyeriana | GB, VC29 Cambridgeshire, Wendy | Peter Derek Sell | | 7/6/1953 | CGE |
| Salix pentandra x fragilis = S. x meyeriana | GB, VC29 Cambridgeshire, Wendy | Peter Derek Sell | | 15/5/1969 | CGE |
| Salix caprea x cinerea = S. x reichardtii | GB, VC29 Cambridgeshire, Wicken Fen | Peter Derek Sell | | 12/6/1986 | CGE |
| Salix caprea x cinerea = S. x reichardtii | GB, VC29 Cambridgeshire, Wicken Lode | Peter Derek Sell | | 8/7/1986 | CGE |
| Salix caprea x cinerea = S. x reichardtii | GB, VC20,VC29, Royston | Peter Derek Sell | | 23/8/1993 | CGE |
| Salix alba x babylonica = S. x sepulcralis var. chrysocoma | GB, VC30 Bedfordshire, Eyeworth | Peter Derek Sell | | 23/3/1991 | CGE |
| Salix alba x babylonica = S. x sepulcralis var. chrysocoma | GB, VC30 Bedfordshire, Eyeworth | Peter Derek Sell | | 23/3/1991 | CGE |
| Carex otrubae | GB, VC31 Huntingdonshire, Great Gransden | Peter Derek Sell | Cambridge University | 16/6/1961 | BM |
+ | Hieracium exotericum | GB, VC39 Staffordshire, Hamps & Manifold Valleys | Claude Evrard Aldington Andrews Cyril West Peter Derek Sell | | 18/6/1954 | BIRM |
+ | Pilosella peleteriana subsp. tenuiscapa | GB, VC39 Staffordshire, Wetton,Wetton Mill | John Norton Mills Peter Derek Sell | John Norton Mills | 19/6/1966 | MANCH |
+ | Pilosella peleteriana x officinarum = P. x longisquama | GB, VC39 Staffordshire, Wetton,Wetton Mill | John Norton Mills Peter Derek Sell | John Norton Mills | 5/6/1966 | MANCH |
+ | Hieracium asteridiophyllum | GB, VC42 Breconshire, Craig y Cilau | Peter Derek Sell | | 22/6/1953 | BIRM |
+ | Hieracium leyanum | GB, VC42 Breconshire, Cwm Tarrell | Claude Evrard Aldington Andrews John Earle Raven Peter Derek Sell | | 22/6/1953 | BIRM |
+ | Hieracium exotericum | GB, VC57 Derbyshire, Chee Dale | Claude Evrard Aldington Andrews Cyril West Peter Derek Sell | | 19/6/1954 | BIRM |
+ | Hieracium subprasinifolium | GB, VC57 Derbyshire, Chee Dale | Claude Evrard Aldington Andrews Cyril West Peter Derek Sell | | 19/6/1954 | BIRM |
+ | Hieracium exotericum | GB, VC57 Derbyshire, Cressbrook Dale | Claude Evrard Aldington Andrews Cyril West Peter Derek Sell | | 21/6/1954 | BIRM |
+ | Hieracium diaphanoides | GB, VC57 Derbyshire, Litton Dale | Claude Evrard Aldington Andrews Cyril West Peter Derek Sell | | 20/6/1954 | BIRM |
| Carex canescens | GB, VC66 County Durham, Cow Green | A Loader B A Golding G Robinson Peter Derek Sell | Cambridge University | 2/7/1969 | E |
| Carex dioica | GB, VC66 County Durham, Cow Green | A Loader B A Golding G Robinson Margaret Elizabeth Bradshaw Peter Derek Sell | Cambridge University | 3/7/1969 | BM |
| Carex dioica | GB, VC66 County Durham, Cow Green | A Loader B A Golding G Robinson Margaret Elizabeth Bradshaw Peter Derek Sell | Cambridge University | 3/7/1969 | E |
| Carex panicea | GB, VC66 County Durham, Cow Green | A Loader B A Golding G Robinson Peter Derek Sell | Cambridge University | 3/7/1969 | E |
| Carex capillaris | GB, VC66 County Durham, Upper Slapstone Sike | A Loader B A Golding G Robinson Margaret Elizabeth Bradshaw Peter Derek Sell | Cambridge University | 3/7/1969 | E |
+ | Hieracium subplanifolium | GB, Tideswell | Claude Evrard Aldington Andrews Cyril West Peter Derek Sell | | 20/6/1954 | BIRM |
| Mentha arvensis x aquatica = M. x verticillata | IE, VCH3 West Cork, Gearagh | Peter Derek Sell | | 13/8/1952 | CGE |