Former Distribution of British Plants. 139 



Polygonum Persicaria, L. 

 Neolithic : — 



Lacustrine deposits of the Scottish Lowlands, Hailes, 



Redhall, Gayfield, Broughton, Elie. 



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. 



Recorded from the Dryas Zone of Gotland (Gunnar 

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

 Nathorstj. 



Oxyria digyna, Hill. 

 Late Glacial : — 



Corstorphine, near Edinburgh. 



RUMEX CONGLOMERATES, Murr. 

 Roman Period : — 



Silchester, Hampshire. 



