24 Botanical Section [PT i 



GRASSES GROUPED ACCORDING TO THEIR HABITAT. 



1. Chalk and Limestone Formations (dry, open, hilly areas). 



Festuca ovina var. vulgaris. 



Aira flexuosa. 



Nardus stricta. 



Sesleria cserulea (chiefly in N. Britain). 



Triodia deeumbens. 



Avena pratensis. 



Koeleria cristata. 



Bromus erectus. 



Avena flavescens (less typical). 



2. Sandy Soils (dry and porous). 



Bromus sterilis. 

 B. arvensis and vars. 

 Poa pratensis. 

 Agrostis Spica-venti. 

 Aira praecox. 

 A. caryophyllea. 

 A. canescens. 



3. Sandy Sea Shores. 



Psamma arenaria. 



Elymus arenarius. 



Agropyrum junceum. 



Phleum arenarium. 



Hordeum maritimum. 



Poa maritima. 



Lepturus incurvatus (rather uncommon). 



Cynodon Dactylon. 



4. Preferring stiff moist Clays, or wet soils generally. 



Festuca elatior and vars. 



Phleum pra tense. 



Alopecurus agrestis (on arable land). 



A. pratensis (especially in semi-shade). 



Poa trivialis (especially in semi-shade). 



Anthoxanthum odoratum (especially in semi-shade). 



