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

Nymphoides peltata Kuntze
Fringed Water-lily
National Status: Nationally Scarce, not
threatened
County Status: Not scarce (15 sites, 18 tetrads)
Site Grid Reference Last Record
Earith, Old Bedford River TL3874 1993 (HFFS)
Hemingford Grey, Marsh Lane Pits TL299700 2008 (LF)
Hinchingbrooke Country Park TL218714
58
TL221711
2008 (DB)
2010 (MiB)
New Cut (Black Ham) Drain TL22309190 2011 (MiB)
Paxton Pits Nature Reserve, Rudd Pit TL194627 2010 (DB)
Portholme SSSI & SAC, Alconbury Brook TL237712 2009 (DB)
Ramsey St Mary’s Bridge, Old River Nene TL254873 2009 (DB)
Houghton Meadow, River Great Ouse TL28977094 2010 (DB)
River Nene (Old Course), Stoke’s Bridge TL243882 1996 (TB)
River Nene (Old Course), New Fen Farm TL271871 1996 (TB)
River Nene (Old Course), Bodsey Bridge TL294878 1996 (TB)
River Nene (Old Course), Wells Bridge TL299881 1996 (TB)
River Nene (Old Course), Dairy Farm TL311906 1996 (TB)
River Nene (Old Course), Broadall’s Drove TL322910 1996 (TB)
River Ouse, The Rhymers TL272719 1995 (TW)
Woodwalton Fen, Great Raveley Drain TL233837
TL234844
Yaxley Lode TL190919
TL2090
2010 (DB)
2010 (DB)
2011 (LF)
2011 (MiB & PS)
Nationally, this scarce native species has had its range significantly expanded and confused
due to the establishment of numerous populations resulting from garden escapes and throwouts.
In Huntingdonshire, it is similarly difficult to segregate native colonies from those that
are of non-native origin. It has been suggested that flower morphology might be indicative,
with only ‘pin’ flowered plants being native in the East Anglian fens (Stewart et al. 1994).
However, while this might raise doubts about the status of any ‘thrum’ flowered colonies,
thrum plants are presumably not the only ones found in cultivation. Given this, it would seem
sensible to treat all populations as native unless they are obviously associated with a garden
setting or unless their origin can otherwise be elucidated. All of the sites listed above fall
within the floodplain of the River Great Ouse or are associated with fenland drains.
Oenanthe crocata L.
Hemlock Water-dropwort
National Status: Not scarce, not threatened County Status: Scarce (5 sites, 6 tetrads)
Site Grid Reference Last Record
Godmanchester, River Ouse TL242709 2009 (DB)