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

Trifolium striatum L.
Knotted Clover
National Status: Not scarce, not threatened County Status: Rare (3 sites, 3 tetrads)
Site Grid Reference Last Record
Conington ‘Dump’ TL202840 2009 (SL)
Ferry Meadows Country Park (CP) TL145975 1998 (TD)
Paxton Pits Nature Reserve TL199627 2000 (RE)
This species shows an affinity for old gravel pit complexes where the shallow, mineral-rich
soils and sparse vegetation provide suitable niches.
Triglochin palustris L.
Marsh Arrowgrass
National Status: Not scarce, not threatened County Status: Rare (2 sites, 2 tetrads)
Site Grid Reference Last Record
St Neots Common SSSI, Lammas Meadow TL181612 2009 (DB)
Woodwalton Fen SSSI & SAC,
Compartment 37
81
TL23118518 2010 (MM)
This is a very rare species in Huntingdonshire. The only other known site was a flood
meadow at Water Newton where it was last recorded in 1968.
Urtica dioica L. ssp. galeopsifolia (Wierzb. ex Opiz) Chrtek
Fen Nettle
National Status: Data Deficient County Status: Rare (2 sites, 4 tetrads)
Site Grid Reference Last Record
Holme Fen SSSI TL1989
TL2088
Woodwalton Fen SSSI & SAC TL2282 (tetrad)
TL2384
2007 (DB)
2009 (DB)
2007 (DB)
2007 (DB)
This is the stingless taxon of fens and river banks. Visitors to Holme and Woodwalton Fen will
have found it a refreshing change to wade through beds of nettle unmolested. Plants at
Holme Fen are morphologically very variable, with widespread stingless forms that otherwise
resemble ssp. dioica. These may indicate the presence of a hybrid swarm resulting from the
mixing of the two subspecies as the fen has dried out over time. More research is needed.