GRASSES OF BRITAIN. XXUI 



easionally with a minute point from the summit. Stigmas long and 

 slender. Six species, P. pratense, P. alpinum, P. Michelii^ P. are- 

 nariunif P. asperum, P. Boehmeri. 



POLYPOGON. — Glumes vs-ith long slender awns. Floret half 

 the length of the glumes. Outer palea without lateral ribs, tipped 

 with a prominent awn. Stigmas bushy. Two species, P. monspe- 

 liensis, P. Uttoralis. 



PHALARIS. — Outer palea without lateral ribs. Leaves broad, 

 flat. Two species, P. canariensis, P. arundinacea. 



AiMMOPHILA. — Outer palea five-ribbed. Leaves narrow, in- 

 volute. Glumes narrow, pointed, without lateral ribs. One species, 

 A. arundinacea. 



AGROSTIS. — Glumes nearly equal. Lowermost glume the 

 larger. Floret much shorter than the glumes, of two very unequal 

 paleae. Sometimes the inner palea is wanting. Base of the floret 

 occasionally with a minute tuft of hairs, Fom* species. A, vulgaris^ 

 A. alba, A. canina, A. setacea. 



ANEMAGROSTIS. — Glumes unequal. Lowermost glume the 

 smaller. Floret as long as the glumes. Outer palea with a long 

 awn more than three times the length of the palea. 



CALAMAGROSTIS.— Glumes nearly equal. Florets of two 

 very unequal paleae. Outer palea awned, fm*nished at the base with 

 long hairs, more than half the length of the floret, sometimes longer 

 than the floret. Four species, C. stricta, C. Epigejos, C. lanceo- 

 lata, C. Lapponica. 



GASTRIDIU]\I. Glumes nearly equal, ventricose at the base. 

 Floret not half the length of the glumes. Outer palea with an a\vn 

 more than twice its length. One species, G. lendigerum. 



STIPA. — Floret with a featherv awn, more than five times its 

 length. Leaves setaceous. One species, S. pennata. 



