66 



BAKERS NORTH YORKSHIRE. 



So that we have the plant growing more or less abundantly 

 in all the tracts (see table at page 51) which are underlaid by 

 the dysgeogenous beds, but entirely absent from the wide inter- 

 mediate areas underlaid by the more porous and more humid 

 strata. It follows the limestone from east to west through the 

 irregularities of its dispersion and is entirely restricted to that 

 fourth portion of the area of North Yorkshire to which the 

 limestone is restricted. How closely the distribution of many 

 of these Xerophilous species corresponds with that of Aquilegia 

 a glance at what is said respecting them in the botanical portion 

 of these notes will shew. The following species shew clearly 

 a similar lithological restriction, but not in a manner so decidedly 

 marked as in the case of those which have already been named. 



LIST OF SUBXEROPHILOUS SPECIES. 



Arabis hirsuta 

 Viola hirta 

 Cerastium arvense 

 Anthyllis Vulneraria 

 Rosa spinosissima 

 Poterium Sanguisorba 

 Pastinaca sativa 



Ascending Plants : 



Dipsacus pilosus 

 Scabiosa Columbaria 

 Lacluca virosa 

 Carlina vulgaris 

 Campanula glomerata 

 Gentiana Amarella 

 Ligustrum vulgare 



Atropa Belladonna 

 Origanum vulgare 

 Calamintha Acinos 

 Lithospermum oiificinale 

 Juniperus communis 

 Spiranthes autumnalis 



Draba incana 

 Arena ria verna 

 Dryas octopetala 



Descending Plants 



Rubus saxatilis 

 Galium sylvestre 

 Gentiana verna 



Melica nutans. 



In these two lists aboriginally native species only have been 

 included and together they take in about one in thirteen of our 

 indigenous flowering plants and ferns. When these species pass 

 beyond the limits of the dysgeogenous fourth of North York- 

 shire they always grow over dry sandy rock or dry sandy or 

 gravelly detritus, avoiding the clayey and rich heavy soils. 

 Next to the immediate neighbourhood of compact calcareous 

 rock they evidently prefer stations where sand so loosely bound 



