286 
Matthews .— The Distribution of certain 
and in Wales, among which may be mentioned Actaea spicata , L., Viola 
rupestris , Schmidt, Arenaria nliginosa , Schlecht, Arenaria gothic a, Fr., 
Potentilla rupestris , L., Polemonium coeruleum , L., Cypripedium Calceolus , 
Diagram 2. Distribution of 129 rare f English’ species. 
L., Maianthemwn bifolium , Sch., Lloydia alpina , Salisb., Potamogeton rutilis , 
Wolf., ornithopoda , Willd., and Ammophila baltica , Link. Some of 
these enter into the montane or boreal flora of England. None of them is 
known from pre-glacial deposits, and one, Arenaria gothica, is recorded from 
the glacial beds of the Cam Valley. This species, occurring on the Continent 
