graminej:. 231 



PSAMMA, Pal. de Beauv. 



877. P. arenaria, B. ^ 8. Mat Grass. 



Native ; in loose sea-sands, abundant on the coast of 

 North Somerset. Its great importance as a metos 

 of restraining the drifting sand is recognised among 

 the huge sand-hills towards Berrow and Burnham, 

 where this grass is systematically planted in situa- 

 tions needing its binding agency. Were it not 

 for its powerful influence in building up suitable 

 barriers against the advance of the shore sand, im- 

 pelled by the prevailing west winds, a large tract 

 of land now under cultivation would be rendered 

 desert and useless. VII. VIII. 



CALAMAGROSTIS, Adans. 



878. C. epigeios, Both. 



Native ; in thickets and shady places, very rare. 



S. Border of Bishop's Wood, Wells; Miss Livett. 

 By the roadside between the Monument and Tracy 

 Park ; Fl. Bathon. It has been reported to grow 

 also at Clevedon, Hutton, and elsewhere, but upon 

 insufficient authority. VII. 



AGROSTIS, Linn. 



879. A. canina, L. 



Native ; on downs, heaths, and commons, frequent. 

 G. Clifton Down. Filton. Mangotsfield Common. 



Stapleton. Yate Common. 

 S. Backwell. Blackdown on Mendip. Upper 



Knowle. Dundry Hill. Leigh Down. VII. VIII. 



880. A. vulgaris, With. 



Native ; on banks and in dry pastures, very common. 



VI. VII. 



