liy FLORAL CHARACTERS [CH. Vll 



jf Palea distinctly hijid at the apex: awn 

 nearly twice its length. A very small 

 grass about six inches high: leaves sub- 

 ulate, fine and short. 



A. cai^yophyllea, L. 



XX Palece almost imperceptibly bidentate: 

 awn not much longer than palea. About 

 12 — 18 inches high: leaves inrolled. 



A. flexuosa, L. 



Other species of Aira, with more condensed inflorescences, are 

 dealt with on p, 112. Agrostis is distinguished by the leaves and 

 one-flowered spikelets (see p. 104). Poa and Catabrosa have no 

 awua. 



