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

Ranunculus sardous Crantz
Hairy Buttercup
National Status: Not threatened, not scarce County Status: Rare (1 site, 1 tetrad)
Site Grid Reference Last Record
Ellington Thorpe TL144699 2011 (BD)
This is a species of damp arable field margins, tracks and disturbed grassland on heavy soils
(Wilson & King, 2003). It has probably always been rare in Huntingdonshire, where it may be
vulnerable to agricultural herbicides. BD found it to be abundant at the arable farmland site
listed above.
Rorippa x anceps (Wahlenb.) Rchb.
R. amphibia x sylvestis
National Status: Not threatened, not scarce County Status: Rare (1 site, 2 tetrads)
Site Grid Reference Last Record
Earith, River Ouse TL3774
70
TL3874 (monad)
2009 (DB)
2009 (DB)
The morphology of this fertile hybrid is intermediate between that of the parents and
resembles a very large R. sylvestris. It is a plant often found in the lower reaches of large
rivers and can occur in the absence of both parents. It has been known at Earith since at least
1844.
Rosa rubiginosa L.
Sweet Briar
National Status: Not scarce, not threatened County Status: Rare (3 sites, 3 tetrads)
Site Grid Reference Last Record
Norman Cross Pits TL16449105 2010 (NC)
Paxton Pits TL196629
TL19326341
2010 (DB)
2010 (DB)
Woodston Pits Nature Reserve TL17399782 2009 (DB)
Very rare and at present no populations are known that can be definitively identified as native,
but the above locations are plausible and should be treated as native for the time being. This
species is now widely planted, e.g. by the A14 and at Crown Lakes Country Park, but these
bushes seem very robust and may not be of good native stock.
Rosa stylosa Desv.
Short-styled Field-rose
National Status: Not scarce, not threatened County Status: Rare (3 sites, 4 tetrads)
Site Grid Reference Last Record
Aversley Wood SSSI TL163819 2008 (DB)