Former Distribution of British Plants. 1 1 7 



Late Glacial : — 



Roxburgh Street, Greenock (?). 



Interglacial: — 



Endsleigh Street, London; West Wittering, Sussex. 



POTENTILLA COMARUM, Nestl. 

 Neolithic: — 



Redhill, near Edinburgh; Hailes, near Edinburgh. 



Late Glacial : — 



Kirk Michael, Isle of Man ; Close y Garey, Isle of 

 Man. 



Interglacial: — 



Airdrie, Lanarkshire. 



Alchemilla arvensis, Lam. 

 Roman Period : — 



Silchester, Hampshire. 



Neolithic: — 



Redhall, near Edinburgh. 



Interglacial : — 



West Wittering, Sussex. 



As only a single achene has been sent to me from 

 Redhall, this may possibly be a recent specimen acci- 

 dentally introduced. At West Wittering achenes are 

 fairly common. 



POTERIUM OFFICINALE, Hook. 

 Neolithic : — 



Redhall, near Edinburgh; Cowden Glen, Renfrewshire. 



