42 



A NEW FLORA OF 



plants which he finds to be most characteristic ; and of those 

 which he names for the dysgeogenous strata, we have in Korth- 

 umberland and Durham eight species only, whilst out of the 

 eugeogenous fifty which are frequent in the arenaceous Yosges, 

 but either nearly or quite absent in the calcareous Jura under 

 parallel, or nearly parallel, conditions of atmospheric climate, 

 we have thirty-five species, which are the following : — 



List of NorthumlerlanA 

 teristically Eugeogenous in 



. Orobus tnberosns. 

 Pruiius padus. 

 Betula alba. 

 Spartium scoparium. 

 Quercus sessiliflora. 

 Ahius glutinosa. 

 Calluna vulgaris. 

 Aira flexuosa. 

 Hieracium boreale. 

 Ononis spinosa. 

 Jaslone montana. 

 Hypericum pulchrum. 

 Stellaria holostea. 

 Galeopsis ochroleuca. 

 Trifolium fragiferum. 

 Luzula multiflora. 

 Filago minima. 

 Aira csespitosa. 



and Durham Plants which are charac- 

 Central Europe. 



Alopecurus pratensis. 

 Triodia decumbens. 

 Rumex acetosella. 

 Montia fontana. 

 Nardus stricta. 

 Hypericum humifusum. 

 Senecio sylvaticus. 

 aquaticus. 

 Arenaria rabra. 

 Lotus major. 

 Vaccinium myi'tillus. 

 Juncus squaiTOSus. 

 Meum athamanticum. 

 Digitalis purpurea. 

 Galium saxatile. 

 Saxifraga stellaris. 

 Asplenium septentrionale. 



We have in this list most, or very nearly all, the very species 

 which make up the gregarious swamp-heather-land vegetation of 

 which we have spoken as covering, with us, such wide tracts of 

 surface. Of the four kinds of rock — limestone, porphyry, slate, 

 and sandstone mixed with shale, that in the North of England 

 form hill-masses on a grand scale, there are none from which 

 these plants as a class are excluded, though it is amongst the 

 sandstones that the ericetal species especially attain their greatest 

 luxuriance and frequency. To sum up the bearings of the sub- 

 jacent rocks on plant-topography, as exercised with us, as com- 

 pared with what takes place in Central Europe, we shall be safe 



