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, 
Nathorst). 
OXYRIA DIGYNA, Hill. 
Late Glacial :-— 
Corstorphine, near Edinburgh, 
RUMEX CONGLOMERATUS, Murr. 
Roman Period :— 
Silchester, Hampshire. 
