108 POA FLUITANS. 



panicled. Panicle almost upright, long and slender, having 

 rough branches arranged in pairs on the rachis. Spikelets few, 

 long and linear, striped with green and white, of six to fourteen 

 florets, the apex of basal floret stretching considerably beyond 

 the large glume of the calyx. Calyx consisting 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 mar- 

 ginal ribs. 



Unlike all other of the Poas, and even Festuca pratensis 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. 



