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 pratense 
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 stricta 
Spergularia rubra Carex binervis 
Potentilla erecta C. Goodenowli 
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. filiforme 
Spiraea Filipendula Hippocrepis comosa 
“ Potentilla verna” Hypericum hirsutum 
Agrimonia Eupatoria Viola hirta (agg.) 
Poterium Sanguisorba Daucus Carota 
Anthyllus Vulneraria Satureia Clinopodium 
“Trifolium striatum ” Origanum vulgare 
