+ | Carex muricata subsp. lamprocarpa | GB, VC87 West Perthshire, Ewe Lairs | Christopher David Preston Helen E Stace Nicholas F Stewart | | 14/9/1985 | PTH |
+ | Chaerophyllum aureum | GB, VC87 West Perthshire, Callander | Christopher David Preston Nicholas F Stewart | | 17/6/1988 | PTH |
+ | Equisetum arvense | GB, VC87 West Perthshire, Callander | Christopher David Preston Nicholas F Stewart | | 17/6/1988 | PTH |
+ | Festuca x loliaceum | GB, VC87 West Perthshire, Callander | Christopher David Preston Nicholas F Stewart | | 17/6/1988 | PTH |
| Potamogeton coloratus | GB, VC29 Cambridgeshire, Wicken Fen | Christopher David Preston J.M. Croft | Cambridge University | 1/7/1987 | E |
| Potamogeton coloratus | GB, VC103 Mid Ebudes, Coll Island | Christopher David Preston Nicholas F Stewart | Cambridge University | 7/7/1989 | E |
| Potamogeton coloratus x gramineus = P. x billupsii | GB, VC110 Outer Hebrides, Loch na Liana Mòire | Christopher David Preston Helen E Stace J H Bratton Nicholas F Stewart S D Webster | Cambridge University | 10/9/1987 | E |
| Potamogeton compressus | GB, VC47 Montgomeryshire, Vrynwy Aqueduct | Christopher David Preston Sarah J Whild | | 4/7/1998 | BIRM |
| Potamogeton compressus | GB, VC47 Montgomeryshire, Vyrnwy Aqueduct | Christopher David Preston Sarah J Whild | | 4/7/1998 | BIRM |
| Potamogeton gramineus | GB, VC29 Cambridgeshire, Block Fen, Chatteris | B A Adams Christopher David Preston | Cambridge University | 12/7/1988 | E |
| Potamogeton gramineus | GB, VC29 Cambridgeshire, Block Fen, Chatteris | Christopher David Preston Nicholas F Stewart | Cambridge University | 28/7/1988 | E |
| Potamogeton gramineus | GB, VC92 South Aberdeenshire, Loch of Aboyne | Christopher David Preston Peter M Hollingsworth | | 24/8/1994 | E |
| Potamogeton gramineus | GB, VC103 Mid Ebudes, Loch Ballyhaugh | Christopher David Preston Nicholas F Stewart | Cambridge University | 6/7/1989 | E |
| Potamogeton gramineus | GB, VC106 East Ross & Cromarty, Loch Ussie | Christopher David Preston | Cambridge University | 24/7/1988 | E |
| Potamogeton gramineus | GB, VC106 East Ross & Cromarty, Loch Ussie | Christopher David Preston | Cambridge University | 24/7/1988 | E |
| Potamogeton gramineus | GB, VC110 Outer Hebrides, An Lige Mor | Christopher David Preston Helen E Stace Nicholas F Stewart S Webster | Cambridge University | 8/9/1987 | E |
| Potamogeton gramineus | IE, VCH38 Co. Down, Downpatrick | Christopher David Preston Paul Hackney R Forbes R Weyl | Cambridge University | 16/8/1987 | E |
| Potamogeton lucens | GB, VC5 South Somerset, Midelney | Christopher David Preston | Cambridge University | 11/7/1987 | E |
| Potamogeton lucens | GB, VC31 Huntingdonshire, Godmanchester | Christopher David Preston J M Croft | Cambridge University | 1/7/1987 | E |
| Potamogeton lucens | GB, VC64 Mid-west Yorkshire, Malham Tarn | Christopher David Preston P P Abbott | Cambridge University | 23/7/1989 | E |
| Potamogeton lucens x gramineus = P. x angustifolius | GB, VC101 Kintyre, Aucha Lochy | Christopher David Preston Nicholas F Stewart | Cambridge University | 19/6/1988 | E |
| Potamogeton lucens x gramineus = P. x angustifolius | GB, VC101 Kintyre, Aucha Lochy | Christopher David Preston Nicholas F Stewart | Cambridge University | 19/6/1988 | E |
| Potamogeton lucens x gramineus = P. x angustifolius | GB, VC101 Kintyre, Loch Barnluasgan | Christopher David Preston M G B Hughes Nicholas F Stewart | Cambridge University | 20/6/1988 | E |
| Potamogeton lucens x gramineus = P. x angustifolius | GB, VC101 Kintyre, Loch Coille-Bharr | Christopher David Preston M G B Hughes Nicholas F Stewart | Cambridge University | 20/6/1988 | E |
| Potamogeton lucens x gramineus = P. x zizii | GB, VC101 Kintyre, Aucha Lochy | Christopher David Preston Nicholas F Stewart | Cambridge University | 19/6/1988 | E |
| Potamogeton natans | GB, VC96 East Inverness-shire, Nairn | Christopher David Preston | Cambridge University | 25/7/1988 | E |
| Potamogeton natans x polygonifolius = P. x gessnacensis | GB, VC112 Shetland, Scat Ness | Christopher David Preston Peter M Hollingsworth | Cambridge University | 1/8/1996 | E |
| Potamogeton polygonifolius | GB, VC101 Kintyre, Island of Danna | Christopher David Preston M G B Hughes Nicholas F Stewart | Cambridge University | 20/6/1988 | E |
| Potamogeton polygonifolius | GB, VC101 Kintyre, Tangy Loch | Christopher David Preston Nicholas F Stewart | Cambridge University | 19/6/1988 | E |
| Rumex frutescens | GB, VC41 Glamorganshire, Penarth Pill | Christopher David Preston | John Robert Akeroyd | 1983 | SLBI |
| Salix caprea x cinerea = S. x reichardtii | GB, VC28 West Norfolk, Castle Rising | Christopher David Preston Peter M Hollingsworth | | 17/5/1993 | CGE |
| Salix caprea x cinerea = S. x reichardtii | GB, VC29 Cambridgeshire, Sawston Moor | Christopher David Preston Peter Derek Sell | | 16/6/1987 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC52 Anglesey, Llyn Maelog | Christopher David Preston Nicholas F Stewart | | 27/8/1989 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC64 Mid-west Yorkshire, Otley | Christopher David Preston P P Abbott | | 22/7/1989 | CGE |
| Salix viminalis x caprea = S. x smithiana | GB, VC93 North Aberdeenshire, Loch of Strathbeg | Christopher David Preston David Welch Peter M Hollingsworth | | 25/8/1994 | CGE |
| Salix viminalis x caprea = S. x smithiana | IE, VCH25 Co. Roscommon, Ballaghaderreen | Christopher David Preston | | 22/8/1988 | CGE |
| Salix viminalis x caprea = S. x smithiana | IE, VCH25 Co. Roscommon, Ballaghaderreen | Christopher David Preston | | 22/8/1988 | CGE |
| Salix viminalis x caprea = S. x smithiana | IE, VCH26 East Mayo, Cloonfallagh | Christopher David Preston | | 21/7/1994 | DBN |
| Salix viminalis x caprea = S. x smithiana | IE, VCH26 East Mayo, Cloonfallagh | Christopher David Preston | | 21/7/1994 | CGE |
| Salix viminalis x caprea = S. x smithiana | IE, VCH35 West Donegal, Carrowkeel | Christopher David Preston Nicholas F Stewart | | 25/8/1989 | CGE |
| Salix viminalis x caprea = S. x smithiana | IE, VCH35 West Donegal, Dunglow Lough | Christopher David Preston Nicholas F Stewart S D Webster | | 22/8/1989 | CGE |
| Salix viminalis x caprea = S. x smithiana | IE, VCH35 West Donegal, Lough Meela | Christopher David Preston Nicholas F Stewart S D Webster | | 23/8/1989 | CGE |