Rare Plant Register for Huntingdonshire - Botanical Society of the ...

occur on the VC31 side of the River or in connected watercourses, but access is poor and it
has not been possible to investigate this further.
Potamogeton friesii Rupr.
Flat-stalked Pondweed
National Status: Nationally Scarce, Near
Threatened
County Status: Rare (2 sites, 2 tetrads)
Site Grid Reference Last Record
Godmanchester, Cow Lane Pits TL25667182 2010 (DB)
Warboys Turf Fen TL3282 2001 (DWr)
A species of (usually) calcareous ditches, drains, canals and rivers. In 2010 it was found
frequently in the wash-up zone along the northern edge of a flooded gravel pit at
Godmanchester. It can tolerate some eutrophication (Preston, 1995) but is still vulnerable to
declining water quality.
Potamogeton x angustifolius J. Presl.
Long-leaved Pondweed
National Status: Nationally Scarce, not
threatened
County Status: Rare (1 site, 1 tetrad)
Site Grid Reference Last Record
Warboys Turf Fen TL3282 2001 (DWr)
In Huntingdonshire and Cambridgeshire this is typically a species of fenland drains, including
drains flowing through intensive arable farmland. It may be under-recorded but is very unlikely
to prove common.
Potamogeton x cooperi (Fryer) Fryer
Cooper’s Pondweed
National Status: Nationally Scarce, not
mentioned in Red Data List
County Status: Rare (1 site, 1 tetrad)
Site Grid Reference Last Record
Fletton, Lakefield Lake (CP) TL1996 1990 (SL & MG)
One of the more frequent pondweed hybrids and perhaps overlooked for P. perfoliatus, one of
the parent species (Preston, 1995).
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