118 POA LOLIACEA. 



twelve florets. Calyx of two equal, acute glumes, destitute of 

 lateral ribs. Dorsal rib prominent. Florets of two palese, ex- 

 terior one of basal floret five-ribbed, marginal ribs broad, having 

 a white band down the centre. 



It is occasionally difficult to recognise P. loliacea from P. 

 rigida. 



Length from two to five inches. Root annual and fibrous. 



Flowers in the middle of July, and ripens its seed in a 

 month. 



The specimen for illustration was gathered in the Island of 

 Anglesea, by Mr. Joseph Sidebotham. 



