126 



VEGETATION OF THE PEAK DISTRICT 



[CH. 



Lime-loving, on the 

 whole 



Arenaria verna 

 A. serpyllifolia 

 Thlaspi alpestre 

 Arabis hirsuta 

 Poterium Sanguisorba 

 Anthylliis Vulneraria 

 Helianthemum Cha- 



maecistus 

 Sedum acre 

 Gentiana baltica 

 Thymus Serpyllum 

 Plantago media 

 Galium verum 

 G. sylvestre 



var. uitidulum 

 Carlina vulgaris 

 Carduus nutans 

 Avena pubescens 

 Koeleria cristata (agg.) 



Humus-loving, on the 

 whole 



Pteris aquilina 

 Potentilla erecta 

 P. procumbens 

 Ulex Gallii 

 U. europaeus 

 Lathyrus montanus 

 Polygala depressa 

 Galium saxatile 

 Erica cinerea 

 Calluna vulgaris • 

 Vaccinium Myrtillus 

 V. Vitis-idaea 

 Deschampsia flexuosa 

 Nardus stricta 

 J uncus squarrosus 

 J. efFusus 



forma compactus 

 Luzula multiflora 



forma congesta 



Ubiquitous 



Botrychiura Lunaria 

 Ranunculus bulbosus 

 Lotus corniculatus 

 Linum catharticum 

 Viola lutea 

 Conopodium majus 

 Gentiana Araarella 

 Veronica oificinalis 

 Plantago lanceolata 

 Crepis virens 

 Hypochaeris radicata 

 Leontodon hispidus 

 Hieracium Pilosella 

 Anthoxanthum odora- 



tum 

 Agrostis vulgaris 

 Briza media 

 Festuca ovina 

 Carex flacca 

 Luzula campestris 



Pseudo-Calcareous Heaths 



The true calcareous heath should not be confused with the 

 alternation of lime-loving and humus-loving species where this 

 alternation is due to the occurrence of non-calcareous detritus 

 or drift in a chalky or limestone district. Such a tract of 

 vegetation is made up of the mixture of small societies or 

 associations belonging to two or more plant formations, just as 

 the terrestrial vegetation of small islands dotted about a lake 

 differs from the aquatic vegetation in the lake itself. The true 

 calcareous heath occurs on soil where there is no drift or foreign 

 soil of any kind ; and the transitional nature of the vegetation 

 is due to a secular and gradual change in the nature of the 

 primitive, calcareous soil. 



Again, many of the higher summits of that portion of north 

 Derbyshire which is indicated, on the geological maps, as 

 consisting of Carboniferous Limestone are capped by a layer 

 of non-calcareous chert ; and on this, of course, normal siliceous 

 grassland and moorland frequently occur. 



