128 



Plant-formation of Siliceous Soils 



species occurring m 

 Pennines : — 



Prunus Cerasus 

 Pyrus Aucuparia 

 Ilex Aquifolium 

 Praxinua excelsior 

 AInus glutinosa 



Ulex Gallii 

 U. europteua 

 Prunus spinosa 

 P. Padus 

 Eubus spp. 

 B. cassius 

 Eosa canina 

 E. arveusis 

 Pyrus Malus 



Hedera Helix 



the Quercetum sessilifloree of the 



Trees. 

 1 

 f tola 



Ulmus glabra (U. 



la 2 



1 

 f 

 o 



la 

 a 

 ri 







lai 

 o 



Betula tomentosa 

 Quercus sessiliflora 

 Salix fragilis 



mon- 

 tana) 



d 



11. 



Shrubs. 



Crataegus monogyna 



(C. Oxyacantha) 

 Acer oampestre 

 Sambucus nigra 

 Viburnum Opulus 

 Corylus Avellana 

 Salix caprea 

 S. cinerea 

 S. aurita 



Climbers. 



1 Lonioera Periclymenum 



Ground vegetation. 



(1) Sub-association of damp situations. 



Anemone nemorosa 

 Eanunculus auricomus 

 E. Ficaria 

 TroUius europ£Bus 

 Aquilegia vulgaris 

 Caltba palustris 

 Cardamine amara 

 C. pratensis 



C. sylvatica (C. flexuosa) 

 Viola Eiviniana 

 Lychnis dioica (Melan- 



drium rubrum) f 

 Stellaria Holostea a 



S. nemorum la 



Oxalia Acetoaella a 



Vioia sepium a 



V. sylvatica r 



Geum rivale la^ 



G. urbanum 1 



Fragaria vesoa f 



Spiraea Ulmaria la^ 

 Chrysosplenium oppositi- 



folium la^ 



C. alternifolium P 



Epilobium montanum f 



E. palustre 1^ 



Circffia lutetiana la 



Sauicula europoea la 



Heracleum Sphondylium f 



Angelica aylvestria 1' 



Asperula odorata 1 



Valeriana dioica r^ 



1 Chiefly at lower altitudes. ^ Chiefly near streams. 



^ Chiefly in marshy places. 



