118 VEGETATION OF THE PEAK DISTRICT [CH. 



above that altitude and on the limestone plateaux, all three 

 species are only of local occurrence. Thus the calcareous 

 grassland presents a different physiognomy from much of the 

 siliceous grassland, the former having a cleaner aspect and a 

 greener and more regular turf. In addition to the above 

 gregarious plants, many other humus-loving species are absent 

 or almost absent from the calcareous grassland of the slopes of 

 the limestone dales; and the following is a list of such species, 

 omitting the plants of marshy places : 



Pteris aquilina Vaccinium Myrtillus 



Nephrodium montanum V. Vitis-idaea 



( = N. Oreopteris) Scutellaria minor 



Athyrium Filix-foemina Digitalis purpurea 



Salix repens Melampyrum praten.se 



S. aurita Galium saxatile 



Cytisus scoparius Scabiosa Succisa 



Genista anglica Jasione montana 



G. tinctoria Gnaphalium sylvaticum 



Ononis repens Holcus mollis 



Lathyrus montanus Aira praecox 



Polygala serpyllacea Deschampsia flexuosa 



Empetrum nigrum Molinia caerulea 



Hypericum humifusum Nardus strieta 



Spergularia rubra Carex binervis 



Potentilla erecta C. Goodenowii 

 P. procumbens var. juncella 



Ulex Gallii JuncUs squarrosus 



U. europaeus Luzula multiflora 

 Calluna vulgaris forma congesta 



Erica cinerea Orchis ericetorum 

 E. Tetralix 



On the other hand, the following plants, excluding those of 

 the marshy places (see Chapter VI), are found in some parts 

 of the calcareous grassland but are absent or quite rare in 

 those of siliceous grassland: 



1. In grassy places: 



Sedum acre T. fili forme 



Spiraea Filipendula Hippocrepis comosa 



"Potentilla verna" Hypericum hirsutum 



Agrimonia Eupatoria Viola hirta (agg.) 



Poterium Sanguisorba Caucus Carota 



Anthyllus Vulneraria Satureia Cliuopodium 



"Trifolium striatum" Origanum vulgare 



