108 POA FLUITANS. 



of two obtuse, membranous, very unequal-sized glumes, destitute of 

 lateral ribs. Florets of two paleae; exterior palea of basal floret seven 

 ribbed, dorsal rib not reaching to the apex, minutely dentate. Lateral 

 ribs rough. Inner palea shorter, bifid, having two green marginal 

 ribs. 



Unlike all other of the Poas, and even Festuea prate nsis of Hudson, 

 which it most resembles, has only five ribs on outer palea, and the 

 dorsal rib quite smooth. 



Flowers towards the end of June, and ripens its seeds before the 

 beginning of August. 



The specimen for illustration was gathered at Ambleside. 



