154 Sub-formation of the Older Limestones 



The species of shrubs of the limestone scrub association 

 are as follows : 



Limestone grassland association (Festucetum ovinie). 



From calcareous scrub, every transition may be traced 

 to pure grassland. Typical calcareous grassland consists 

 of short, grassy turf, largely composed of the sub-aerial 

 parts of the sheep's fescue-grass {Pestuca ovina). Such 

 grassland is characteristic and widespread on the slopes 

 of the limestone hills of the west and north of England 

 and equally so on the chalk downs of the south (see 

 p. 173). 



