Former Distribution of British Plants. 139 



Polygonum Persicaria, L. 

 Neolithic : — 



Lacustrine deposits of the Scottish Lowlands, Hailes, 

 Redhall, Gayfield, Broughton, EHe. 



Late Glacial : — 



Twickenham, Middlesex. 



Interglacial : — 



West Wittering, Sussex ; Endsleigh Street, London. 



Preglacial (Cromer Forest-bed): — 

 Pakefield, Suffolk. 



Polygonum lapathifolium, L. 

 Neolithic (?) :— 



Cowden Glen, Renfrewshire. 



Polygonum amphibium, L. 

 Unknown fossil in Britain. 

 Recorded by Dr. Gunnar Andersson from South Sweden. 



Polygonum viviparum, L. 

 Unknown fossil in Britain. 1 



Recorded from the Dryas Zone of Gotland (Gunnar 



Andersson) ; and from Deuben, in Saxony (A. G. 



Nathorst). 



OXYRIA digyna, Hill. 

 Late Glacial : — 



Corstorphine, near Edinburgh. 



RUMEX CONGLOMERATUS, Murr. 

 Roman Period : — 



Silchester, Hampshire. 



