Rare Plant Register for Huntingdonshire - Botanical Society of the ...
Rare Plant Register for Huntingdonshire - Botanical Society of the ...
Rare Plant Register for Huntingdonshire - Botanical Society of the ...
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Potamogeton x fluitans Roth.<br />
Potamogeton lucens x Potamogeton natans<br />
National Status: Nationally <strong>Rare</strong>,<br />
Vulnerable<br />
County Status: <strong>Rare</strong> (1 site, 1 tetrad)<br />
Site Grid Reference Last Record<br />
Woodwalton Fen SSSI & SAC TL234852 2005 (MM)<br />
This rare hybrid is o<strong>the</strong>rwise only known from localities in Cambridgeshire, Dorset, Hampshire<br />
and Norfolk. It is normally sterile and does not produce turions; as such, it is dependent on its<br />
vigorous rhizomes <strong>for</strong> its long-term persistence at a site (Preston, 1995).<br />
Potentilla anglica Laichard<br />
Trailing Tormentil<br />
National Status: Not scarce, not threatened County Status: <strong>Rare</strong> (3 sites, 4 tetrads)<br />
Site Grid Reference Last Record<br />
Brampton Wood SSSI TL17266974<br />
Holme Fen SSSI:<br />
Holme Lode Covert<br />
Middle Covert<br />
67<br />
TL18327042<br />
TL20278896<br />
TL203892<br />
2009 (DB)<br />
2008 (DB)<br />
2008 (DB)<br />
2007 (DB)<br />
Monks Wood SSSI TL19667985 2008 (DB)<br />
This species is a scarce constituent <strong>of</strong> ancient woodland rides, although it is much better<br />
recorded now than previously. It is best searched <strong>for</strong> in late summer, once <strong>the</strong>re has been an<br />
opportunity <strong>for</strong> <strong>the</strong> fruit to <strong>for</strong>m.<br />
Primula elatior (L.) Hill<br />
Oxlip<br />
National Status: Nationally Scarce, Near<br />
Threatened<br />
County Status: <strong>Rare</strong> (2 sites, 3 tetrads)<br />
Site Grid Reference Last Record<br />
Waresley Wood SSSI TL2554<br />
TL2654<br />
2010 (DB)<br />
2010 (DB)<br />
Wennington Wood TL2478 2004 (PB)<br />
Primula elatior is a native perennial herb that is restricted to a compact area <strong>of</strong> Great Britain,<br />
where it is found, sometimes in local abundance, in ancient woods and copses on <strong>the</strong> chalky<br />
boulder clay in East Anglia. It is a shade tolerant species, but only flowers in pr<strong>of</strong>usion in <strong>the</strong><br />
increased light levels that follow tree felling or coppicing. It is confined to an area where <strong>the</strong><br />
soils are seasonally waterlogged and ill-aerated and it has a poorly developed drought<br />
tolerance. There has been a steady reduction in <strong>the</strong> density <strong>of</strong> this species in woodland sites<br />
during <strong>the</strong> past centuries, but <strong>the</strong>re has been little change in its hectad distribution. Changes<br />
in climate, woodland management practices and intensities <strong>of</strong> deer grazing are likely to<br />
adversely affecting populations <strong>of</strong> this species. Since it colonises new or secondary<br />
woodlands very slowly, management needs to focus on <strong>the</strong> conservation <strong>of</strong> ancient semi-
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