baker's north YORKSHIRE. 



With us several of the most characteristically paludal plants 

 which are common in the neighbourhood of York and Thirsk 

 are altogether confined to the vales and nowhere ascend into 

 the dales or amongst the lower levels of the hill-slopes. This is 

 the case with Thalidnim flavum, Nymph(za alba, Nasturtium 

 amphibium, Cerastmm aquaticutn, Utricularia vulgaris, Hottonia, 

 Hydrocharis, Sagittaria, Butomus, Potamogeton densus, Lemna 

 trisulca and several other species. 



In Central Europe we have, as in North Yorkshire, ranges of 

 hills of well-marked contrasting lithological character, the Jura 

 dysgeogenous and the Vosges and Black Forest eugeogenous. 

 The following are the thirty-one species which inhabit North 

 Yorkshire which are given by M. Thurmann as characteristically 

 eugeogenous. These are plants which ascend and are frequent 

 amongst the eugeogenous Vosges and Black Forest but are 

 either rare amongst or altogether absent from the dysgeogenous 

 Jura, under parallel or nearly parallel conditions of atmospheric 

 climate. 



LIST OF NORTH YORKSHIRE PLANTS 



WHICH ARE 



CHARACTERISTICALLY EUGEOGENOUS IN 



:ENTRAL EUROPE. 



Orobus tuberosus 



Stellaria holostea 



Senecio sylvaticus 



Prunus Padus 



Tri folium fragiferum 



,, aquaticus 



Betula alba 



Luzula multiflora 



Spergularia rubra 



Sarothamnus scoparius 



Filago minima 



Vaccinium Myrtillus 



Quercus sessiliflora 



Aira cKspitosa 



Juncus squarrosus 



Calluna vulgaris 



Alopecurus pratensis 



Meum athamanticum 



Aira flexuosa 



Triodia decumbens 



Digitalis purpurea 



Hieracium boreale 



Rumex Acetosella 



Galium saxatile 



Ononis spinosa 



Montia fontana 



Saxifraga stellaris. 



Jasione montana 



Nardus stricta 





Hypeiicum pulchrum 



Hypericum humifusum 





We see that we have in this list most or very nearly all the 

 very species which make up the gregarious swamp-heatherland 

 vegetation of which we have spoken as covering in our country 

 such wide tracts of surface. These species are several of them 

 our commonest North Yorkshire plants and ascend amongst 



